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# Implementation Summary

**Session ID**: `phase19-session02-server-backbone` **Package**: apps/server **Completed**: 2026-06-26 **Duration**: 1 hour

***

## Overview

Completed the server-side command-center backbone for Phase 19. The session adds manager-owned in-memory command-center scaffolds, validation adapters, root and `/api` REST routes, compact WebSocket hydration and mutation events, diagnostics counts, redaction-safe stored payload behavior, tests, and documentation while keeping real executor families unavailable until later sessions implement their permission, audit, redaction, and execution gates.

***

## Deliverables

### Files Created

| File                                                     | Purpose                                                                                                                          | Lines |
| -------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------- | ----- |
| `apps/server/src/managers/orchestrationCommandCenter.ts` | Command-center manager scaffolds, counts, idempotency, revision checks, capability envelopes, cleanup, and compact event entries | 1440  |
| `apps/server/src/lib/commandCenterValidation.ts`         | Route query, body, ID, idempotency, expected revision, and protocol parser validation adapters                                   | 333   |
| `apps/server/src/routes/commandCenter.ts`                | REST snapshot and scaffold mutation route bindings with broadcast helpers                                                        | 358   |
| `apps/server/tests/commandCenterManager.test.ts`         | Manager coverage for idempotency, stale revisions, compact entries, cleanup, counts, ordering, and unavailable capabilities      | 191   |
| `apps/server/tests/commandCenterRoutes.test.ts`          | Route coverage for snapshots, mutations, validation failures, duplicate handling, events, `/api` parity, and capability errors   | 299   |

### Files Modified

| File                                                 | Changes                                                                                                 |
| ---------------------------------------------------- | ------------------------------------------------------------------------------------------------------- |
| `apps/server/src/server.ts`                          | Instantiated the command-center manager, mounted routes, and wired diagnostics and WebSocket hydration. |
| `apps/server/src/ws/handlers.ts`                     | Added deterministic command-center hydration frames.                                                    |
| `apps/server/src/lib/orchestrationDiagnostics.ts`    | Added command-center scaffold availability and bounded counts.                                          |
| `apps/server/tests/orchestrationDiagnostics.test.ts` | Covered command-center diagnostics compactness.                                                         |
| `apps/server/tests/websocket.test.ts`                | Covered command-center hydration and mutation events.                                                   |
| `apps/server/tests/suggestionWebsocket.test.ts`      | Updated hydration drain expectations for the expanded frame sequence.                                   |
| `apps/server/README_server.md`                       | Documented scaffolded command-center routes, events, and non-executing boundaries.                      |
| `docs/api/README_api.md`                             | Added API rows and boundary notes for command-center endpoints.                                         |
| `docs/api/event-api-hook-contracts.md`               | Added route/event reconciliation notes for command-center server frames.                                |

***

## Technical Decisions

1. **Capability-first scaffolding**: Real file, git, terminal, container, remote, Worker, hosted, and channel execution remains unavailable until later sessions add concrete permission, audit, redaction, tests, and docs.
2. **Manager-owned state**: Command-center records, idempotency keys, expected revisions, cleanup, and counts live in a server manager to match existing local orchestration patterns.
3. **Boundary-specific redaction**: Stored command-center string fields are redacted before REST snapshots or WebSocket frames can echo obvious secrets, URLs, or broad absolute paths.

***

## Test Results

| Metric   | Value                                                                                                            |
| -------- | ---------------------------------------------------------------------------------------------------------------- |
| Tests    | 2685 passed, 1 skipped                                                                                           |
| Passed   | Server typecheck, focused tests, full server tests, root format, root lint, workspace typecheck, and root Vitest |
| Coverage | Not reported                                                                                                     |

***

## Lessons Learned

1. Command-center summary fields are useful for scaffold records, but they must be sanitized at storage boundaries rather than trusted because broad views reuse those values.
2. WebSocket hydration sequence changes need compatibility coverage in adjacent tests, not only in the new command-center tests.

***

## Future Considerations

Items for future sessions:

1. Wire the web shell and store to these protocol-shaped snapshots and compact events without presenting unavailable executor families as executable.
2. Add per-family execution only when the relevant permission, audit, redaction, rollback, output cap, tests, and documentation gates are in scope.

***

## Session Statistics

* **Tasks**: 20 completed
* **Files Created**: 5 implementation deliverables
* **Files Modified**: 9 implementation deliverables
* **Tests Added**: 2 new test files plus existing diagnostics and WebSocket coverage
* **Blockers**: 0 resolved


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