> For the complete documentation index, see [llms.txt](https://faction-os.gitbook.io/faction-os-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faction-os.gitbook.io/faction-os-docs/.spec_system/archive/sessions/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase21-session04-shortcut-and-overlay-layering` **Package**: apps/web **Started**: 2026-06-29 18:35 **Last Updated**: 2026-06-29 18:54

***

## Session Progress

| Metric              | Value     |
| ------------------- | --------- |
| Tasks Completed     | 21 / 21   |
| Estimated Remaining | 0 minutes |
| Blockers            | 0         |

***

## Task Log

### 2026-06-29 - Session Start

**Environment verified**:

* [x] Prerequisites confirmed
* [x] Tools available
* [x] Directory structure ready

**Notes**:

* Local prereq script passed for package `apps/web`.
* Node 26.2.0 and npm 11.16.0 are available through nvm and will be used for workspace checks.
* Behavioral Quality Checklist is active because this session changes application code.

***

### Task T001 - Verify Session 03 completion evidence and current Session 04 stub scope

**Started**: 2026-06-29 18:35 **Completed**: 2026-06-29 18:36 **Duration**: 1 minute

**Notes**:

* Confirmed Session 03 validation passed, with 22/22 tasks complete and no unresolved blockers.
* Confirmed Session 04 PRD stub scopes keyboard shortcut routing, overlay layering, Escape order, backdrop close, and inner-panel containment for `apps/web`.
* Confirmed Session 04 remains bounded to web shortcut and overlay presentation behavior; backend execution, hosted service, Worker, remote execution, trusted erasure, and formal accessibility certification are out of scope.

**Files Changed**:

* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Added the progress summary and marked T001 complete.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T001 evidence.

**Verification**:

* Command/check: `sed -n '1,260p' .spec_system/PRD/phase_21/session_04_shortcut_and_overlay_layering.md`
  * Result: PASS - Stub scope matches the current Session 04 spec.
  * Evidence: The stub requires `o d` to open the expanded Command Center surface, secondary details summary behavior, shared overlay markers, nested Escape order, backdrop close, inner-click containment, and shortcut/modal tests.
* Command/check: `sed -n '1,260p' .spec_system/specs/phase21-session03-orchestration-command-center-expansion/validation.md`
  * Result: PASS - Session 03 completed before this implementation.
  * Evidence: Validation result is PASS; task completion is 22/22; focused tests, full tests, web typecheck, workspace typecheck, format, lint, and ASCII/LF checks passed.
* Command/check: `sed -n '1,220p' .spec_system/specs/phase21-session03-orchestration-command-center-expansion/tasks.md`
  * Result: PASS - Prior session task checklist is complete.
  * Evidence: Every Session 03 task row is marked `[x]`, including primary Command Center open path and secondary state summary behavior.
* UI product-surface check: N/A - Task was spec and evidence review only.
* UI craft check: N/A - No UI implementation changed.

***

### Task T002 - Audit current shortcut metadata, route mapping, and shortcut modal expectations

**Started**: 2026-06-29 18:36 **Completed**: 2026-06-29 18:38 **Duration**: 2 minutes

**Notes**:

* Confirmed `o d` currently maps to `command_center_details_open` and the visible/help copy says `Open Orchestration details.`
* Confirmed the global keyboard hook delegates the `o` sequence through `routeCommandCenterShortcutKey`, so the fixed action name and route can stay centralized in shortcut metadata.
* Confirmed `KeyboardShortcutsModal` renders shared `SHORTCUTS_HELP` rows and uses `commandCenterShortcutAriaLabel`, so component code should not need a custom Orchestration branch unless metadata changes reveal a test gap.
* Identified copy-sensitive tests in `commandCenterShortcuts.test.ts`, `keyboardShortcuts.test.ts`, and `KeyboardShortcutsModal.test.tsx`.

**Files Changed**:

* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T002 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T002 evidence.

**Verification**:

* Command/check: `nl -ba apps/web/src/lib/commandCenterShortcuts.ts | sed -n '1,260p'`
  * Result: PASS - Current route/action drift was identified.
  * Evidence: Action union includes `command_center_details_open`; help row `o d` uses `Open Orchestration details.`; `ACTION_BY_SEQUENCE_KEY.d` resolves to the details action; resolver labels that action as details with target kind `details`.
* Command/check: `nl -ba apps/web/src/lib/useKeyboardShortcuts.ts | sed -n '1,320p'`
  * Result: PASS - Global route path and dispatch boundary were identified.
  * Evidence: `SHORTCUTS_HELP` spreads command-center metadata and `routeKey` delegates through `routeCommandCenterShortcutKey`.
* Command/check: `nl -ba apps/web/tests/keyboardShortcuts.test.ts | sed -n '1,360p'`
  * Result: PASS - Global routing and DOM dispatch expectations were identified.
  * Evidence: Tests expect `o d` to dispatch `command_center_details_open` and `defaultDispatchCommandCenterShortcut` to emit that action.
* Command/check: `nl -ba apps/web/tests/commandCenterShortcuts.test.ts | sed -n '1,320p'`
  * Result: PASS - Pure shortcut expectations were identified.
  * Evidence: Tests verify unique combos, the `o d` row, and an ARIA label of `Open Orchestration details. Shortcut O then D.`
* Command/check: `nl -ba apps/web/tests/KeyboardShortcutsModal.test.tsx | sed -n '1,280p'`
  * Result: PASS - Modal copy expectations were identified.
  * Evidence: Orchestration section test expects `Open Orchestration details.` and its accessible label.
* UI product-surface check: N/A - Task was source and test audit only.
* UI craft check: N/A - No UI implementation changed.

***

### Task T003 - Audit current Escape, backdrop, and portal behavior for expanded Orchestration and nested drawers

**Started**: 2026-06-29 18:38 **Completed**: 2026-06-29 18:39 **Duration**: 1 minute

**Notes**:

* Confirmed `BottomRailExpansionHost` registers an Escape listener while expanded and closes the focused surface whenever Escape is not already default-prevented.
* Confirmed the bottom-rail backdrop closes the focused surface and the expanded card stops click propagation; panel clicks in expanded mode do not close the surface.
* Confirmed `OrchestrationDetailPortal`, `OrchestrationDrawer`, `ExecutorRunHistoryDrawer`, and `TerminalRuntimeDrawer` render portal/backdrop DOM while open and already own their close behavior.
* Confirmed nested Escape order needs a parent-level higher-layer guard because parent and child listeners are all registered on `window`.
* Confirmed existing host tests cover base Escape, backdrop close, focus restore, same-instance preservation, and compact click guards; Session 04 needs added higher-layer and expanded inner-click coverage.

**Files Changed**:

* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T003 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T003 evidence.

**Verification**:

* Command/check: `nl -ba apps/web/src/components/BottomRailExpansionHost.tsx | sed -n '1,260p'`
  * Result: PASS - Parent Escape/backdrop/click behavior was identified.
  * Evidence: Host Escape listener closes on unhandled Escape; backdrop click calls `closeSurface`; expanded inner card stops propagation; panel click opens only when compact and non-interactive.
* Command/check: `rg -n "detailsOpen|OrchestrationDetailPortal|openCommandCenterSurface|command_center_details_open|COMMAND_CENTER_SHORTCUT_EVENT|selectedDetail|terminalDrawerOpen|OrchestrationDrawer|TerminalRuntimeDrawer|ExecutorRunHistoryDrawer|setDetailsOpen|setTerminalDrawerOpen|Escape|onClose|onOpen" apps/web/src/components/orchestration/OrchestrationShell.tsx`
  * Result: PASS - Shell state, shortcut event handling, and nested overlay mounting points were identified.
  * Evidence: Shell owns `detailsOpen`, `terminalDrawerOpen`, `selectedDetail`, the command-center shortcut listener, and portal/drawer render sites.
* Command/check: `nl -ba apps/web/src/components/orchestration/OrchestrationCurrentState.tsx | sed -n '320,440p'`
  * Result: PASS - Retained state summary portal/backdrop behavior was identified.
  * Evidence: `OrchestrationDetailPortal` portals to `document.body`; backdrop click calls `onClose`; inner aside stops propagation.
* Command/check: `nl -ba apps/web/src/components/orchestration/OrchestrationDrawer.tsx | sed -n '1,240p'`
  * Result: PASS - Command-center record drawer behavior was identified.
  * Evidence: Drawer portals to `document.body`; Escape/backdrop call `onClose`; inner aside stops propagation; execution records delegate to `ExecutorRunHistoryDrawer`.
* Command/check: `nl -ba apps/web/src/components/orchestration/TerminalRuntimeDrawer.tsx | sed -n '1,260p'`
  * Result: PASS - Terminal runtime drawer behavior was identified.
  * Evidence: Drawer portals to `document.body`; Escape/backdrop call `onClose`; inner aside stops propagation and contains terminal forms.
* Command/check: `nl -ba apps/web/tests/BottomRailExpansionHost.test.tsx | sed -n '1,320p'`
  * Result: PASS - Existing host regression coverage was identified.
  * Evidence: Tests cover base Escape close/listener cleanup, backdrop close, same-surface exclusivity, state preservation, compact click open, and guarded compact interactive clicks.
* UI product-surface check: N/A - Task was source and test audit only.
* UI craft check: N/A - No UI implementation changed.

***

### Task T004 - Create shared overlay-layer constants and query helpers with deterministic ordering

**Started**: 2026-06-29 18:40 **Completed**: 2026-06-29 18:39 **Duration**: 1 minute

**Notes**:

* Added a small shared overlay-layer module with stable `data-overlay-layer` names for bottom-rail surfaces, the retained Orchestration state summary, command-center drawers, execution-history drawers, and terminal runtime drawers.
* Added rank-based helpers for active layer queries, higher-layer detection, top-layer resolution, and JSX-friendly marker attributes.
* Kept the helper browser-safe by avoiding default `document` evaluation when no DOM exists.

**Files Changed**:

* `apps/web/src/lib/overlayLayers.ts` - Added shared overlay-layer names, ranks, marker props, and query helpers.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T004 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T004 evidence.

**Verification**:

* Command/check: `npm run typecheck --workspace @factionos/web`
  * Result: PASS - Web package TypeScript compilation succeeded.
  * Evidence: `tsc -b --noEmit` completed with exit code 0 under Node 26.2.0.
* Command/check: `nl -ba apps/web/src/lib/overlayLayers.ts`
  * Result: PASS - Helper contains stable layer constants and deterministic order.
  * Evidence: The file defines `OVERLAY_LAYER_ATTRIBUTE`, `OVERLAY_LAYERS`, `OVERLAY_LAYER_ORDER`, `hasHigherOverlayLayer`, `topOverlayLayer`, and `isTopOverlayLayer`.
* UI product-surface check: N/A - Task added a non-rendered helper only.
* UI craft check: N/A - No UI layout or copy changed.

***

### Task T005 - Add bottom-rail overlay-layer semantics and higher-layer Escape guard with cleanup on scope exit for the host listener

**Started**: 2026-06-29 18:39 **Completed**: 2026-06-29 18:39 **Duration**: 1 minute

**Notes**:

* Marked expanded bottom-rail hosts with the shared bottom-rail overlay layer.
* Updated the host Escape listener to skip parent close when a higher active overlay layer exists.
* Preserved the existing listener cleanup path and backdrop/inner-panel click behavior.

**Files Changed**:

* `apps/web/src/components/BottomRailExpansionHost.tsx` - Imported overlay-layer helpers, marked expanded hosts, and added the higher-layer Escape guard.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T005 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T005 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/BottomRailExpansionHost.test.tsx`
  * Result: PASS - Existing host behavior still passes.
  * Evidence: 1 test file passed; 16 tests passed; 0 failed.
* Command/check: `nl -ba apps/web/src/components/BottomRailExpansionHost.tsx | sed -n '1,260p'`
  * Result: PASS - Expanded host now uses the shared bottom-rail layer and higher-layer guard.
  * Evidence: Source imports `hasHigherOverlayLayer`, `OVERLAY_LAYERS`, and `overlayLayerAttributes`; Escape returns early when a higher layer exists; expanded sections receive the bottom-rail overlay marker.
* UI product-surface check: PASS - The change adds only DOM data markers and does not introduce user-facing debug/scaffolding copy.
* UI craft check: PASS - No layout, copy, or visible styling changed; backdrop and inner-panel behavior remains covered by existing focused tests.

**BQC Fixes**:

* Resource cleanup: Preserved the existing keydown listener cleanup while adding the higher-layer guard (`apps/web/src/components/BottomRailExpansionHost.tsx`).

***

### Task T006 - Mark the retained orchestration state summary portal as a higher overlay layer

**Started**: 2026-06-29 18:40 **Completed**: 2026-06-29 18:40 **Duration**: 1 minute

**Notes**:

* Marked `OrchestrationDetailPortal`/state summary modal with the shared higher overlay layer.
* Updated the shell-owned state-summary Escape listener to close only when the state-summary layer is topmost.
* Preserved existing backdrop click, inner-panel click containment, close button, and portal behavior.

**Files Changed**:

* `apps/web/src/components/orchestration/OrchestrationCurrentState.tsx` - Added the state-summary overlay-layer marker.
* `apps/web/src/components/orchestration/OrchestrationShell.tsx` - Added the top-layer Escape guard for the retained state summary.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T006 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T006 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Existing Orchestration panel and state-summary behavior still passes.
  * Evidence: 1 test file passed; 27 tests passed; 0 failed.
* Command/check: `nl -ba apps/web/src/components/orchestration/OrchestrationCurrentState.tsx | sed -n '360,385p'`
  * Result: PASS - State summary root carries the shared higher-layer marker.
  * Evidence: The modal root spreads `overlayLayerAttributes(OVERLAY_LAYERS.orchestrationStateSummary)`.
* Command/check: `nl -ba apps/web/src/components/orchestration/OrchestrationShell.tsx | sed -n '838,846p'`
  * Result: PASS - State-summary Escape close is top-layer gated.
  * Evidence: The listener checks `isTopOverlayLayer(OVERLAY_LAYERS.orchestrationStateSummary)` before closing.
* UI product-surface check: PASS - The change adds DOM data markers only and keeps state-summary product copy unchanged.
* UI craft check: PASS - Existing portal, close, backdrop, and inner-panel behavior remained covered by focused tests.

**BQC Fixes**:

* Resource cleanup: Preserved the existing keydown listener cleanup while making the listener top-layer aware (`apps/web/src/components/orchestration/OrchestrationShell.tsx`).

***

### Task T007 - Mark command-center record drawers as higher overlay layers with existing close behavior preserved

**Started**: 2026-06-29 18:41 **Completed**: 2026-06-29 18:42 **Duration**: 1 minute

**Notes**:

* Marked the command-center detail drawer backdrop with the shared command-center drawer overlay layer.
* Marked the nested execution run history drawer backdrop with its own higher overlay layer.
* Updated both Escape listeners to close only when their layer is topmost, preserving existing focus, backdrop, portal, and close-button behavior.

**Files Changed**:

* `apps/web/src/components/orchestration/OrchestrationDrawer.tsx` - Added command-center drawer marker and top-layer Escape guard.
* `apps/web/src/components/orchestration/ExecutorRunHistoryDrawer.tsx` - Added execution-history drawer marker and top-layer Escape guard.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T007 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T007 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Existing command drawer and Orchestration panel behavior still passes.
  * Evidence: 1 test file passed; 27 tests passed; 0 failed.
* Command/check: `nl -ba apps/web/src/components/orchestration/OrchestrationDrawer.tsx | sed -n '50,90p'`
  * Result: PASS - Command-center drawer uses the shared higher-layer marker and top-layer Escape guard.
  * Evidence: The Escape listener checks `isTopOverlayLayer(OVERLAY_LAYERS.commandCenterDrawer)` and the drawer backdrop spreads `overlayLayerAttributes(OVERLAY_LAYERS.commandCenterDrawer)`.
* Command/check: `nl -ba apps/web/src/components/orchestration/ExecutorRunHistoryDrawer.tsx | sed -n '20,45p'`
  * Result: PASS - Execution-history drawer uses the shared higher-layer marker and top-layer Escape guard.
  * Evidence: The Escape listener checks `isTopOverlayLayer(OVERLAY_LAYERS.executorRunHistoryDrawer)` and the backdrop spreads `overlayLayerAttributes(OVERLAY_LAYERS.executorRunHistoryDrawer)`.
* UI product-surface check: PASS - The change adds DOM data markers only and keeps drawer product copy unchanged.
* UI craft check: PASS - Existing drawer portal, focus, close, backdrop, and inner-panel behavior remained covered by focused tests.

**BQC Fixes**:

* Resource cleanup: Preserved existing keydown listener cleanup while making drawer Escape handling top-layer aware (`apps/web/src/components/orchestration/OrchestrationDrawer.tsx`, `apps/web/src/components/orchestration/ExecutorRunHistoryDrawer.tsx`).

***

### Task T008 - Mark the terminal runtime drawer as a higher overlay layer with existing close behavior preserved

**Started**: 2026-06-29 18:42 **Completed**: 2026-06-29 18:43 **Duration**: 1 minute

**Notes**:

* Marked the terminal runtime drawer backdrop with the shared terminal runtime overlay layer.
* Updated the terminal runtime Escape listener to close only when the terminal runtime layer is topmost.
* Preserved existing form handling, focus, close button, backdrop close, and inner-panel click behavior.

**Files Changed**:

* `apps/web/src/components/orchestration/TerminalRuntimeDrawer.tsx` - Added terminal runtime drawer marker and top-layer Escape guard.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T008 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T008 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Existing terminal runtime and Orchestration panel behavior still passes.
  * Evidence: 1 test file passed; 27 tests passed; 0 failed.
* Command/check: `nl -ba apps/web/src/components/orchestration/TerminalRuntimeDrawer.tsx | sed -n '90,130p'`
  * Result: PASS - Terminal runtime drawer uses the shared higher-layer marker and top-layer Escape guard.
  * Evidence: The Escape listener checks `isTopOverlayLayer(OVERLAY_LAYERS.terminalRuntimeDrawer)` and the backdrop spreads `overlayLayerAttributes(OVERLAY_LAYERS.terminalRuntimeDrawer)`.
* UI product-surface check: PASS - The change adds DOM data markers only and keeps terminal runtime product copy unchanged.
* UI craft check: PASS - Existing drawer focus, close, forms, backdrop, and inner-panel behavior remained covered by focused tests.

**BQC Fixes**:

* Resource cleanup: Preserved existing keydown listener cleanup while making terminal runtime Escape handling top-layer aware (`apps/web/src/components/orchestration/TerminalRuntimeDrawer.tsx`).

***

### Task T009 - Rename or replace the primary details shortcut action with a Command Center working-surface action

**Started**: 2026-06-29 18:43 **Completed**: 2026-06-29 18:47 **Duration**: 4 minutes

**Notes**:

* Replaced the details-primary shortcut action with `command_center_open`.
* Removed source references to `command_center_details_open` so the primary action contract now names the working surface.

**Files Changed**:

* `apps/web/src/lib/commandCenterShortcuts.ts` - Renamed the primary shortcut action to `command_center_open`.
* `apps/web/src/lib/useKeyboardShortcuts.ts` - Updated the global dispatch switch for the renamed action.
* `apps/web/src/components/orchestration/OrchestrationShell.tsx` - Updated the command-center shortcut handler case for the renamed action.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T009 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T009 evidence.

**Verification**:

* Command/check: `rg -n "command_center_details_open|Open Orchestration details" apps/web/src apps/web/tests -g '*.{ts,tsx}'`
  * Result: PASS - No stale details-primary shortcut references remain in source or tests.
  * Evidence: Command returned no matches.
* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Focused tests accepted the renamed action.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed.
* Command/check: `npm run typecheck --workspace @factionos/web`
  * Result: PASS - Web package TypeScript compilation succeeded.
  * Evidence: `tsc -b --noEmit` completed with exit code 0 under Node 26.2.0.
* UI product-surface check: PASS - User-facing shortcut action naming now aligns with Command Center working-surface copy.
* UI craft check: PASS - No layout change; shortcut copy remains concise and fits existing modal/header rows.

***

### Task T010 - Repoint the `o d` command-center sequence to the primary Command Center open action

**Started**: 2026-06-29 18:43 **Completed**: 2026-06-29 18:47 **Duration**: 4 minutes

**Notes**:

* Updated the sequence route table so `d` under the `o` prefix resolves to `command_center_open`.
* Updated pure and global routing tests to prove `o` then `d` emits the primary open action.

**Files Changed**:

* `apps/web/src/lib/commandCenterShortcuts.ts` - Repointed `ACTION_BY_SEQUENCE_KEY.d` to `command_center_open`.
* `apps/web/tests/commandCenterShortcuts.test.ts` - Added pure route coverage for `o d`.
* `apps/web/tests/keyboardShortcuts.test.ts` - Updated global route and hook-dispatch expectations for `o d`.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T010 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T010 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Pure and hook route tests passed inside the focused test run.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed, including `commandCenterShortcuts.test.ts` and `keyboardShortcuts.test.ts`.
* Command/check: `nl -ba apps/web/src/lib/commandCenterShortcuts.ts | sed -n '45,125p'`
  * Result: PASS - Source route table maps `o d` to `command_center_open`.
  * Evidence: The `o d` help row and `ACTION_BY_SEQUENCE_KEY.d` use `command_center_open`.
* UI product-surface check: N/A - Task changed routing metadata and tests; visible copy is covered in T011.
* UI craft check: N/A - No UI layout changed.

***

### Task T011 - Update shortcut resolver labels, reasons, target kinds, and ARIA label generation for product-facing Command Center copy

**Started**: 2026-06-29 18:43 **Completed**: 2026-06-29 18:47 **Duration**: 4 minutes

**Notes**:

* Updated the `o d` help row to `Open Command Center.`
* Updated resolver metadata for `command_center_open` to target the Orchestration surface instead of a details target.
* Updated shortcut ARIA expectations so keyboard help exposes `Open Command Center. Shortcut O then D.`

**Files Changed**:

* `apps/web/src/lib/commandCenterShortcuts.ts` - Updated help copy, resolver label, target kind, and target id for `command_center_open`.
* `apps/web/tests/commandCenterShortcuts.test.ts` - Added resolver expectations for `command_center_open` and updated ARIA label assertions.
* `apps/web/tests/KeyboardShortcutsModal.test.tsx` - Updated Orchestration section copy and accessible label expectations.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T011 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T011 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Shortcut metadata, modal copy, and ARIA expectations passed.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed.
* Command/check: `nl -ba apps/web/src/lib/commandCenterShortcuts.ts | sed -n '47,230p'`
  * Result: PASS - Source metadata is product-facing.
  * Evidence: The help row says `Open Command Center.` and resolver returns target kind `surface` with target id `orchestration`.
* UI product-surface check: PASS - Keyboard help copy uses Command Center product language and contains no implementation diagnostics.
* UI craft check: PASS - Existing modal row count and labels are unchanged in shape; copy remains concise.

***

### Task T012 - Update global shortcut action union and dispatch cases for the renamed Command Center action

**Started**: 2026-06-29 18:43 **Completed**: 2026-06-29 18:47 **Duration**: 4 minutes

**Notes**:

* Updated the global keyboard hook dispatch switch to forward `command_center_open`.
* The global shortcut action union continues to include command-center actions through `CommandCenterShortcutAction`, so the source-level type update flows from `commandCenterShortcuts.ts`.

**Files Changed**:

* `apps/web/src/lib/useKeyboardShortcuts.ts` - Updated command-center dispatch switch for `command_center_open`.
* `apps/web/tests/keyboardShortcuts.test.ts` - Updated route, DOM dispatch, and hook integration expectations for the renamed action.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T012 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T012 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Global route and hook integration tests passed.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed, including 55 keyboard shortcut tests.
* Command/check: `nl -ba apps/web/src/lib/useKeyboardShortcuts.ts | sed -n '127,425p'`
  * Result: PASS - The global action type and dispatch switch include `command_center_open`.
  * Evidence: `ShortcutAction` includes `CommandCenterShortcutAction`, and the switch forwards `command_center_open` through `defaultDispatchCommandCenterShortcut`.
* UI product-surface check: N/A - Task changed keyboard plumbing only.
* UI craft check: N/A - No UI layout or copy changed.

***

### Task T013 - Route the primary Command Center shortcut event to the existing focused surface opener with state reset or revalidation on re-entry

**Started**: 2026-06-29 18:43 **Completed**: 2026-06-29 18:47 **Duration**: 4 minutes

**Notes**:

* Routed `command_center_open` in `OrchestrationShell` to `openCommandCenterSurface`.
* Preserved the existing duplicate-open guard in `openCommandCenterSurface`, which returns early when Orchestration is already focused.
* Updated runtime tests so dispatching the shortcut opens `bottom-rail-expanded-orchestration` through the shared host and does not open the state summary.

**Files Changed**:

* `apps/web/src/components/orchestration/OrchestrationShell.tsx` - Routed `command_center_open` to `openCommandCenterSurface` and added the callback to the listener dependencies.
* `apps/web/tests/OrchestrationPanel.test.tsx` - Updated runtime shortcut event coverage for the focused Command Center surface.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T013 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T013 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Runtime shortcut and focused surface tests passed.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed, including 30 Orchestration panel tests.
* Command/check: `nl -ba apps/web/src/components/orchestration/OrchestrationShell.tsx | sed -n '2026,2136p'`
  * Result: PASS - Runtime handler calls the focused surface opener for `command_center_open`.
  * Evidence: The switch case invokes `openCommandCenterSurface()` and no longer opens `detailsOpen` for the primary shortcut.
* UI product-surface check: PASS - Shortcut event opens the product Command Center working surface and leaves the state summary secondary.
* UI craft check: PASS - The shared host renders the existing Command Center surface; no duplicate or generic scaffold surface was introduced.

**BQC Fixes**:

* Duplicate action prevention: The existing `openCommandCenterSurface` guard prevents repeated writes when Orchestration is already focused (`apps/web/src/components/orchestration/OrchestrationShell.tsx`).

***

### Task T014 - Keep retained state-summary behavior secondary without a details-primary shortcut path

**Started**: 2026-06-29 18:43 **Completed**: 2026-06-29 18:47 **Duration**: 4 minutes

**Notes**:

* Kept the retained state summary behind the existing secondary `Open orchestration state summary` control.
* Removed the details-primary shortcut route so keyboard users use `o d` for the focused Command Center surface.
* Existing state-summary modal behavior remains covered by Orchestration tests.

**Files Changed**:

* `apps/web/src/components/orchestration/OrchestrationShell.tsx` - Removed the primary shortcut path to `setDetailsOpen(true)`.
* `apps/web/tests/OrchestrationPanel.test.tsx` - Updated shortcut event tests and retained summary tests for secondary behavior.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T014 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T014 evidence.

**Verification**:

* Command/check: `rg -n "command_center_details_open|Open Orchestration details" apps/web/src apps/web/tests -g '*.{ts,tsx}'`
  * Result: PASS - No details-primary shortcut route or copy remains.
  * Evidence: Command returned no matches.
* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Retained state-summary tests and shortcut tests passed.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed.
* Command/check: `nl -ba apps/web/src/components/orchestration/OrchestrationHeader.tsx | sed -n '60,115p'`
  * Result: PASS - Header still exposes primary Command Center and secondary state-summary controls separately.
  * Evidence: Primary control is `Open Command Center`; secondary control is `Open orchestration state summary`.
* UI product-surface check: PASS - The primary keyboard route is product-facing Command Center copy; state summary remains a secondary inspector.
* UI craft check: PASS - Existing header controls remain in the same compact action group.

***

### Task T015 - Verify expanded Orchestration inner clicks, tab clicks, and form controls do not close the focused surface with platform-appropriate accessibility labels, focus management, and input support

**Started**: 2026-06-29 18:45 **Completed**: 2026-06-29 18:47 **Duration**: 2 minutes

**Notes**:

* Added host-level regression coverage proving inner button, tab-like, and input clicks do not close an already expanded focused surface.
* Existing Orchestration expanded-mode tests continue to prove Command Center tabs remain reachable and update state while expanded.
* Existing host focus tests still prove the focused surface moves focus inside the dialog and restores focus on close.

**Files Changed**:

* `apps/web/tests/BottomRailExpansionHost.test.tsx` - Added expanded inner-control click containment coverage.
* `apps/web/tests/OrchestrationPanel.test.tsx` - Kept expanded Command Center tab reachability coverage aligned with the shortcut path.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T015 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T015 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Inner-click containment and expanded Orchestration tests passed.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed, including 18 host tests and 30 Orchestration panel tests.
* Command/check: `nl -ba apps/web/tests/BottomRailExpansionHost.test.tsx | sed -n '170,245p'`
  * Result: PASS - Test coverage includes expanded inner button, tab-like control, and input clicks.
  * Evidence: The new test clicks inner controls after expansion and asserts the focused surface remains open.
* UI product-surface check: PASS - No new user-facing debug or scaffolding copy was added.
* UI craft check: PASS - Existing focus restoration and tab reachability tests passed; no visible layout changed.

**BQC Fixes**:

* Accessibility and platform compliance: Added regression coverage for native buttons, tab-like controls, and inputs inside the expanded surface (`apps/web/tests/BottomRailExpansionHost.test.tsx`).

***

### Task T016 - Update keyboard shortcut modal copy only where shared metadata changes require component-level adjustment

**Started**: 2026-06-29 18:43 **Completed**: 2026-06-29 18:47 **Duration**: 4 minutes

**Notes**:

* Confirmed `KeyboardShortcutsModal` consumes shared `SHORTCUTS_HELP` metadata and `commandCenterShortcutAriaLabel`.
* No component-level modal source change was required; updated tests prove the shared metadata produces the correct visible copy and accessible label.

**Files Changed**:

* `apps/web/tests/KeyboardShortcutsModal.test.tsx` - Updated Orchestration section copy and accessible label expectations.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T016 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T016 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Keyboard shortcuts modal tests passed with updated shared copy.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed, including 16 keyboard shortcut modal tests.
* Command/check: `nl -ba apps/web/src/components/KeyboardShortcutsModal.tsx | sed -n '28,130p'`
  * Result: PASS - Modal renders shared metadata without component-specific Orchestration copy.
  * Evidence: The modal groups `SHORTCUTS_HELP` and uses `commandCenterShortcutAriaLabel(b)` for row labels.
* UI product-surface check: PASS - Modal displays `Open Command Center.` for `o d` with no implementation diagnostics.
* UI craft check: PASS - Modal section count remains 11 rows and the existing compact row layout is unchanged.

***

### Task T017 - Update pure Command Center shortcut tests for `o d`, action naming, resolver copy, uniqueness, and accessible labels

**Started**: 2026-06-29 18:45 **Completed**: 2026-06-29 18:47 **Duration**: 2 minutes

**Notes**:

* Added pure `o d` route coverage for `command_center_open`.
* Added resolver assertions for Command Center surface target metadata.
* Updated ARIA label expectations for `Open Command Center. Shortcut O then D.`

**Files Changed**:

* `apps/web/tests/commandCenterShortcuts.test.ts` - Updated pure shortcut route, resolver, uniqueness, and accessible label coverage.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T017 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T017 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Pure Command Center shortcut tests passed.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed, including 13 pure Command Center shortcut tests.
* UI product-surface check: N/A - Test-only task.
* UI craft check: N/A - Test-only task.

***

### Task T018 - Update global route and hook integration tests for the primary Command Center shortcut event

**Started**: 2026-06-29 18:45 **Completed**: 2026-06-29 18:47 **Duration**: 2 minutes

**Notes**:

* Updated `routeKey` expectations so `o` then `d` resolves to `command_center_open`.
* Updated the DOM dispatch helper test and hook integration test to assert the primary Command Center event payload.

**Files Changed**:

* `apps/web/tests/keyboardShortcuts.test.ts` - Updated global route, DOM dispatch, and hook integration expectations.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T018 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T018 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Global keyboard shortcut tests passed.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed, including 55 keyboard shortcut tests.
* UI product-surface check: N/A - Test-only task.
* UI craft check: N/A - Test-only task.

***

### Task T019 - Update shortcut modal tests for Orchestration section copy, ARIA labels, and registered shortcut count

**Started**: 2026-06-29 18:45 **Completed**: 2026-06-29 18:47 **Duration**: 2 minutes

**Notes**:

* Updated keyboard shortcut modal assertions for `Open Command Center.`
* Preserved the expected Orchestration section count and registered shortcut count.

**Files Changed**:

* `apps/web/tests/KeyboardShortcutsModal.test.tsx` - Updated Orchestration section copy and accessible label assertions.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T019 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T019 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Keyboard shortcut modal tests passed.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed, including 16 keyboard shortcut modal tests.
* UI product-surface check: PASS - Modal tests assert `Open Command Center.` and `Open Command Center. Shortcut O then D.`
* UI craft check: PASS - Section count remains 11 rows and modal layout source was unchanged.

***

### Task T020 - Add host and Orchestration regressions for higher-layer Escape order, backdrop close, and inner-panel containment

**Started**: 2026-06-29 18:45 **Completed**: 2026-06-29 18:47 **Duration**: 2 minutes

**Notes**:

* Added host coverage proving Escape skips parent close while a higher overlay layer is present and then closes after the higher layer is removed.
* Added host coverage proving expanded inner controls do not close the focused surface.
* Added Orchestration coverage proving Escape closes state summary, command-center drawer, and terminal runtime drawer before the expanded Orchestration surface.
* Existing host backdrop close coverage remains passing.

**Files Changed**:

* `apps/web/tests/BottomRailExpansionHost.test.tsx` - Added higher-layer Escape guard and expanded inner-click containment tests.
* `apps/web/tests/OrchestrationPanel.test.tsx` - Added nested Escape-order regressions for state summary, command-center drawer, and terminal runtime drawer.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T020 complete and updated progress.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded T020 evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Host and Orchestration regression tests passed.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed, including 18 host tests and 30 Orchestration panel tests.
* Command/check: `nl -ba apps/web/tests/OrchestrationPanel.test.tsx | sed -n '1538,1638p'`
  * Result: PASS - Nested Escape-order coverage exists for state summary, command-center drawer, and terminal runtime drawer.
  * Evidence: Tests assert each higher layer closes first and the expanded Orchestration surface remains open until the next Escape.
* UI product-surface check: PASS - Tests assert product surfaces and do not introduce debug/scaffolding UI.
* UI craft check: PASS - Backdrop and inner-control behavior is covered without changing visible layout.

**BQC Fixes**:

* Contract alignment: Added regression tests proving overlay-layer ordering matches the shared host and drawer contracts (`apps/web/tests/BottomRailExpansionHost.test.tsx`, `apps/web/tests/OrchestrationPanel.test.tsx`).

***

### Task T021 - Run focused automated checks and ASCII/LF validation

**Started**: 2026-06-29 18:53 **Completed**: 2026-06-29 18:54 **Duration**: 1 minute

**Notes**:

* Ran the required focused test command, web typecheck, whitespace check, targeted Biome format check, and ASCII/LF validation.
* Biome initially reported formatting-only differences in five touched files; applied targeted Biome formatting and reran the checks successfully.

**Files Changed**:

* `apps/web/src/components/BottomRailExpansionHost.tsx` - Targeted Biome formatting after overlay import changes.
* `apps/web/src/components/orchestration/OrchestrationShell.tsx` - Targeted Biome formatting after top-layer guard changes.
* `apps/web/src/lib/commandCenterShortcuts.ts` - Targeted Biome formatting after resolver metadata changes.
* `apps/web/tests/KeyboardShortcutsModal.test.tsx` - Targeted Biome formatting after modal assertion changes.
* `apps/web/tests/OrchestrationPanel.test.tsx` - Targeted Biome formatting after nested Escape tests.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md` - Marked T021 and completion checklist complete.
* `.spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md` - Recorded final verification evidence.

**Verification**:

* Command/check: `npm test -- apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Focused automated tests passed.
  * Evidence: 5 test files passed; 132 tests passed; 0 failed.
* Command/check: `npm run typecheck --workspace @factionos/web`
  * Result: PASS - Web package TypeScript compilation succeeded.
  * Evidence: `tsc -b --noEmit` completed with exit code 0 under Node 26.2.0.
* Command/check: `git diff --check`
  * Result: PASS - No whitespace errors were reported.
  * Evidence: Command completed with exit code 0 and no output.
* Command/check: `npx biome format --files-ignore-unknown=true apps/web/src/lib/overlayLayers.ts apps/web/src/components/BottomRailExpansionHost.tsx apps/web/src/components/orchestration/OrchestrationCurrentState.tsx apps/web/src/components/orchestration/OrchestrationDrawer.tsx apps/web/src/components/orchestration/ExecutorRunHistoryDrawer.tsx apps/web/src/components/orchestration/TerminalRuntimeDrawer.tsx apps/web/src/lib/commandCenterShortcuts.ts apps/web/src/lib/useKeyboardShortcuts.ts apps/web/src/components/orchestration/OrchestrationShell.tsx apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx`
  * Result: PASS - Targeted Biome format check passed.
  * Evidence: Checked 14 files; no fixes applied after the targeted format write.
* Command/check: `files='apps/web/src/lib/overlayLayers.ts apps/web/src/components/BottomRailExpansionHost.tsx apps/web/src/components/orchestration/OrchestrationCurrentState.tsx apps/web/src/components/orchestration/OrchestrationDrawer.tsx apps/web/src/components/orchestration/ExecutorRunHistoryDrawer.tsx apps/web/src/components/orchestration/TerminalRuntimeDrawer.tsx apps/web/src/lib/commandCenterShortcuts.ts apps/web/src/lib/useKeyboardShortcuts.ts apps/web/src/components/orchestration/OrchestrationShell.tsx apps/web/tests/commandCenterShortcuts.test.ts apps/web/tests/keyboardShortcuts.test.ts apps/web/tests/KeyboardShortcutsModal.test.tsx apps/web/tests/BottomRailExpansionHost.test.tsx apps/web/tests/OrchestrationPanel.test.tsx .spec_system/specs/phase21-session04-shortcut-and-overlay-layering/tasks.md .spec_system/specs/phase21-session04-shortcut-and-overlay-layering/implementation-notes.md'; file $files; LC_ALL=C grep -n '[^[:print:][:space:]]' $files || true; grep -l $'\r' $files || true`
  * Result: PASS - Touched files are ASCII text with LF line endings.
  * Evidence: `file` reported ASCII text for touched files; non-ASCII grep and CRLF grep returned no matches.
* UI product-surface check: PASS - Focused tests and source inspection confirm primary shortcut copy is product-facing and no normal surface exposes debug/scaffolding copy.
* UI craft check: PASS - Focused tests cover modal copy, expanded host containment, backdrop behavior, and nested Escape order without visible layout regressions.

***

## Implementation Summary

* Completed 21 / 21 tasks for `phase21-session04-shortcut-and-overlay-layering`.
* Added shared overlay-layer helpers and wired bottom-rail, state-summary, command-center drawer, execution-history drawer, and terminal runtime drawer layers.
* Repointed `o d` to `command_center_open` and routed it to the focused Command Center surface.
* Kept Orchestration state summary behavior available as a secondary control.
* Added focused tests for shortcut metadata, global dispatch, modal copy, higher-layer Escape order, backdrop close, and inner-panel containment.
* Remaining blockers: none.


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