> 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/phase20-session06-file-mutation-core/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase20-session06-file-mutation-core` **Package**: null **Started**: 2026-06-28 16:52 **Last Updated**: 2026-06-28 17:14

***

## Session Progress

| Metric              | Value     |
| ------------------- | --------- |
| Tasks Completed     | 22 / 22   |
| Estimated Remaining | 0 minutes |
| Blockers            | 0         |

***

### Task T022 - Run Workspace Quality And Whitespace Gates

**Started**: 2026-06-28 17:12 **Completed**: 2026-06-28 17:14 **Duration**: 2 minutes

**Notes**:

* Ran the full workspace quality gate set.
* Initial `format:check` failed on formatting in touched files and initial workspace typecheck failed because `apps/web/src/store/useGameStore.ts` needed to narrow the new execution attachment union. Applied Biome formatting and added the web terminal attachment `kind` guard, then reran all T022 commands successfully.

**Files Changed**:

* `apps/web/src/store/useGameStore.ts` - Added terminal attachment kind checks for the new execution attachment union.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T022 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T022 and completion checklist complete.

**Verification**:

* Command/check: `npm run format:check`
  * Result: PASS - Biome formatting check passed.
  * Evidence: Checked 762 files; no fixes applied.
* Command/check: `npm run lint`
  * Result: PASS - Biome lint passed.
  * Evidence: Checked 764 files; no fixes applied.
* Command/check: `npm run typecheck --workspaces --if-present`
  * Result: PASS - Workspace typecheck passed.
  * Evidence: adapters, server, warroom, web, protocol, and public-website typechecks completed; public website Astro types generated.
* Command/check: `npm test`
  * Result: PASS - Full Vitest passed.
  * Evidence: 268 test files passed, 1 skipped; 3042 tests passed, 1 skipped.
* Command/check: `git diff --check`
  * Result: PASS - Whitespace gate passed.
  * Evidence: Command exited 0 with no output.
* UI product-surface check: N/A - T022 is verification plus type narrowing only; no user-facing UI surface changed.
* UI craft check: N/A - T022 changes no UI layout or copy.

**BQC Fixes**:

* Contract alignment: Added web terminal attachment kind narrowing so web state reconciliation handles the new file attachment union safely (`apps/web/src/store/useGameStore.ts`).

***

### Task T021 - Run Focused Protocol And Server Checks

**Started**: 2026-06-28 17:11 **Completed**: 2026-06-28 17:12 **Duration**: 1 minute

**Notes**:

* Ran the focused protocol/server Vitest suite and package typechecks required by the task.

**Files Changed**:

* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T021 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T021 complete.

**Verification**:

* Command/check: `npx vitest run packages/protocol/tests/fileMutation.test.ts packages/protocol/tests/orchestrationCommandCenter.test.ts apps/server/tests/fileMutationManager.test.ts apps/server/tests/commandCenterManager.test.ts`
  * Result: PASS - 4 test files passed.
  * Evidence: 42/42 focused tests passed.
* Command/check: `npm --workspace packages/protocol run typecheck`
  * Result: PASS - Protocol TypeScript completed successfully.
  * Evidence: `tsc --noEmit` exited 0.
* Command/check: `npm --workspace apps/server run typecheck`
  * Result: PASS - Server TypeScript completed successfully.
  * Evidence: `tsc --noEmit` exited 0.
* UI product-surface check: N/A - T021 is verification only.
* UI craft check: N/A - T021 changes no UI.

***

### Task T020 - Document File Mutation Boundary And Session 07 Handoff

**Started**: 2026-06-28 17:09 **Completed**: 2026-06-28 17:11 **Duration**: 2 minutes

**Notes**:

* Documented the manager-level file mutation boundary, local backup location, redaction rules, compact file execution attachment metadata, and Session 07 no-claim integration handoff.
* Updated older guarded-action wording so file approvals remain approved-not-executing until the Phase 20 Session 07 integration wires the manager through executor registry and route/UI controls.

**Files Changed**:

* `apps/server/README_server.md` - Added manager-level file mutation core, backup, redaction, and integration handoff documentation.
* `docs/api/README_api.md` - Updated API reference and command-center boundary docs for file mutation manager-level behavior and no public apply route.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T020 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T020 complete.

**Verification**:

* Command/check: `rg -n "file mutation ships|file mutation core|fileMutationManager|file-mutations/backups|approved-not-executing until the Phase 20 Session 07|kind: \"file\"" apps/server/README_server.md docs/api/README_api.md`
  * Result: PASS - New docs are present and the stale `file mutation ships` wording is absent.
  * Evidence: Output shows manager boundary, backup path, Session 07 handoff, and `kind: "file"` attachment references only.
* Command/check: `npx vitest run packages/protocol/tests/orchestrationCommandCenter.test.ts apps/server/tests/commandCenterManager.test.ts apps/server/tests/fileMutationManager.test.ts packages/protocol/tests/fileMutation.test.ts`
  * Result: PASS - 4 test files passed.
  * Evidence: 42/42 focused tests passed after documentation updates.
* UI product-surface check: N/A - T020 changes docs only.
* UI craft check: N/A - T020 changes no UI.

***

### Task T019 - Update Command-Center Compatibility Tests For Compact File Execution Metadata

**Started**: 2026-06-28 17:07 **Completed**: 2026-06-28 17:09 **Duration**: 2 minutes

**Notes**:

* Added protocol compatibility coverage proving `CommandCenterExecutionRun` accepts compact `kind: "file"` attachments and rejects raw file content in file attachments.
* Added command-center manager coverage proving saved file execution rows and emitted events include safe path labels and backup ids but exclude content, patch bodies, broad absolute paths, tokens, stdout/stderr, and provider payloads.

**Files Changed**:

* `packages/protocol/tests/orchestrationCommandCenter.test.ts` - Added file execution run parser compatibility coverage.
* `apps/server/tests/commandCenterManager.test.ts` - Added compact file execution manager/event coverage.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T019 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T019 complete.

**Verification**:

* Command/check: `npx vitest run packages/protocol/tests/orchestrationCommandCenter.test.ts apps/server/tests/commandCenterManager.test.ts`
  * Result: PASS - 2 test files passed.
  * Evidence: 32/32 tests passed, including new file execution attachment and command-center event compactness tests.
* UI product-surface check: N/A - T019 changes protocol/server tests only.
* UI craft check: N/A - T019 changes no UI.

***

### Task T016 - Add Server Tests For Successful Mutations And Non-Mutating Read/Preview

**Started**: 2026-06-28 16:52 **Completed**: 2026-06-28 17:06 **Duration**: 14 minutes

**Notes**:

* Added server coverage proving write, edit, delete, move, and rename mutate real temp-directory files.
* Added read and preview assertions proving safe metadata is returned without file content and without mutation.

**Files Changed**:

* `apps/server/tests/fileMutationManager.test.ts` - Added successful mutation and non-mutating read/preview tests.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T016 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T016 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - 1 test file passed.
  * Evidence: 5/5 tests passed, including successful mutation and read/preview scenarios.
* UI product-surface check: N/A - T016 changes server tests only.
* UI craft check: N/A - T016 changes no UI.

***

### Task T017 - Add Server Tests For Rollback, Backup Failure, And Mutation Failure

**Started**: 2026-06-28 16:52 **Completed**: 2026-06-28 17:06 **Duration**: 14 minutes

**Notes**:

* Added rollback tests for restored content, duplicate rollback idempotency, and missing backup failure.
* Added backup failure and mutation failure tests proving files remain unchanged.

**Files Changed**:

* `apps/server/tests/fileMutationManager.test.ts` - Added rollback, backup failure, and mutation failure tests.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T017 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T017 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - 1 test file passed.
  * Evidence: 5/5 tests passed, including rollback/idempotency, missing backup, backup failure, and mutation failure compensation scenarios.
* UI product-surface check: N/A - T017 changes server tests only.
* UI craft check: N/A - T017 changes no UI.

***

### Task T018 - Add Server Tests For Conflict, Stale Hash, Unsafe Paths, And Destination Failures

**Started**: 2026-06-28 16:52 **Completed**: 2026-06-28 17:06 **Duration**: 14 minutes

**Notes**:

* Added server tests proving stale hashes, active file-intent conflicts, symlink escapes, absolute paths, traversal, URL-like paths, NUL input, generated/ignored paths, destination symlink escape, and destination-exists failures leave files unchanged.

**Files Changed**:

* `apps/server/tests/fileMutationManager.test.ts` - Added conflict, stale hash, path rejection, and destination failure tests.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T018 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T018 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - 1 test file passed.
  * Evidence: 5/5 tests passed, including conflict/stale/path/destination rejection cases.
* UI product-surface check: N/A - T018 changes server tests only.
* UI craft check: N/A - T018 changes no UI.

***

### Task T006 - Create FileMutationManager With Injected Dependencies

**Started**: 2026-06-28 17:00 **Completed**: 2026-06-28 17:06 **Duration**: 6 minutes

**Notes**:

* Added `FileMutationManager` with injected workspace root, state root, file intent conflict checker, command-center execution recorder, clock, and filesystem dependency overrides.
* Added manager result envelopes using existing REST error shapes and duplicate/in-flight protection maps.

**Files Changed**:

* `apps/server/src/managers/fileMutationManager.ts` - Created the manager and dependency boundary.
* `packages/protocol/src/rest.ts` - Added `operation_failed` as a general REST error code for bounded operation failures.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T006 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T006 complete.

**Verification**:

* Command/check: `npm --workspace apps/server run typecheck`
  * Result: PASS - Server TypeScript completed successfully after attachment narrowing fixes.
  * Evidence: `tsc --noEmit` exited 0.
* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - 1 server test file passed.
  * Evidence: 5/5 `FileMutationManager` tests passed.
* UI product-surface check: N/A - T006 is backend manager infrastructure.
* UI craft check: N/A - T006 changes no UI.

**BQC Fixes**:

* Duplicate action prevention: Added operation and rollback in-flight locks plus completed idempotency replay maps (`apps/server/src/managers/fileMutationManager.ts`).

***

### Task T007 - Implement Repo-Relative Path Validation And Policy Rejection

**Started**: 2026-06-28 17:00 **Completed**: 2026-06-28 17:06 **Duration**: 6 minutes

**Notes**:

* Implemented protocol and manager path validation for repo-relative paths, absolute paths, traversal, URL-like paths, NUL input, symlink escapes, destination-parent symlink escapes, directory targets, generated paths, and ignored paths.
* Policy rejects generated or ignored segments such as `node_modules`, `dist`, `build`, `.git`, `.factionos`, framework caches, coverage/test output, logs, tsbuildinfo, and local env files.

**Files Changed**:

* `apps/server/src/managers/fileMutationManager.ts` - Added path resolution, realpath containment, symlink escape checks, and generated/ignored policy checks.
* `apps/server/tests/fileMutationManager.test.ts` - Covers unsafe paths, symlink escapes, generated/ignored policy, and destination conflicts.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T007 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T007 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - Path rejection scenarios passed.
  * Evidence: 5/5 tests passed, including `rejects unsafe paths, symlink escapes, generated paths, ignored paths, and destination conflicts`.
* UI product-surface check: N/A - T007 changes backend filesystem validation only.
* UI craft check: N/A - T007 changes no UI.

**BQC Fixes**:

* Trust boundary enforcement: File paths are revalidated at the manager boundary even after protocol parsing (`apps/server/src/managers/fileMutationManager.ts`).

***

### Task T008 - Implement Hashing, Preflight Metadata, Backups, And Local Metadata

**Started**: 2026-06-28 17:00 **Completed**: 2026-06-28 17:06 **Duration**: 6 minutes

**Notes**:

* Added SHA-256 metadata, byte counts, modified timestamps, expected hash checks, backup id generation, backup content writes, and local backup metadata under the injected state root.
* Backup metadata exposes only safe labels, hashes, timestamps, and rollback state; content stays in the local backup content file only.

**Files Changed**:

* `apps/server/src/managers/fileMutationManager.ts` - Added hashing, preflight metadata, backup creation, backup metadata writing, and backup loading.
* `apps/server/tests/fileMutationManager.test.ts` - Covers stale hashes, backup ids, backup failures, and metadata redaction.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T008 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T008 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - Backup and hash scenarios passed.
  * Evidence: 5/5 tests passed, including stale hash and backup failure assertions.
* UI product-surface check: N/A - T008 changes backend metadata only.
* UI craft check: N/A - T008 changes no UI.

***

### Task T009 - Implement Read And Preview Operations

**Started**: 2026-06-28 17:00 **Completed**: 2026-06-28 17:06 **Duration**: 6 minutes

**Notes**:

* Added non-mutating `read` and `preview` handling that returns safe metadata only and does not expose file contents.

**Files Changed**:

* `apps/server/src/managers/fileMutationManager.ts` - Added read/preview execution path.
* `apps/server/tests/fileMutationManager.test.ts` - Covers read/preview behavior and content redaction.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T009 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T009 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - Read/preview scenarios passed.
  * Evidence: Test asserts read/preview return hashes/byte counts, leave files unchanged, and do not serialize file content.
* UI product-surface check: N/A - T009 changes backend manager behavior only.
* UI craft check: N/A - T009 changes no UI.

***

### Task T010 - Implement Write And Edit Operations

**Started**: 2026-06-28 17:00 **Completed**: 2026-06-28 17:06 **Duration**: 6 minutes

**Notes**:

* Added guarded write and exact search/replace edit operations with expected hash checks, idempotency replay, backup-before-mutation, transaction-style execution, and best-effort compensation on mutation failure.

**Files Changed**:

* `apps/server/src/managers/fileMutationManager.ts` - Added write/edit mutation paths and compensation.
* `apps/server/tests/fileMutationManager.test.ts` - Covers successful write/edit, duplicate idempotency, stale hashes, backup failure, and mutation failure compensation.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T010 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T010 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - Write/edit scenarios passed.
  * Evidence: Test asserts on-disk writes/edits, duplicate replay without second mutation, stale hash no-op, backup failure no-op, and mutation failure no data loss.
* UI product-surface check: N/A - T010 changes backend manager behavior only.
* UI craft check: N/A - T010 changes no UI.

**BQC Fixes**:

* Failure path completeness: Mutation failures after backup return caller-visible failures and attempt compensation before returning (`apps/server/src/managers/fileMutationManager.ts`).

***

### Task T011 - Implement Delete Operation

**Started**: 2026-06-28 17:00 **Completed**: 2026-06-28 17:06 **Duration**: 6 minutes

**Notes**:

* Added guarded delete operation with expected hash checks, backup-before-delete, and rollback metadata.

**Files Changed**:

* `apps/server/src/managers/fileMutationManager.ts` - Added delete mutation path.
* `apps/server/tests/fileMutationManager.test.ts` - Covers deleting a real temp-directory file.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T011 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T011 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - Delete scenario passed.
  * Evidence: Test asserts the deleted file is absent and result metadata records `after.exists: false`.
* UI product-surface check: N/A - T011 changes backend manager behavior only.
* UI craft check: N/A - T011 changes no UI.

***

### Task T012 - Implement Move And Rename Operations

**Started**: 2026-06-28 17:00 **Completed**: 2026-06-28 17:06 **Duration**: 6 minutes

**Notes**:

* Added move and rename operations with source/destination validation, expected hash checks, destination-exists rejection, destination parent symlink escape rejection, and same-directory enforcement for rename.

**Files Changed**:

* `apps/server/src/managers/fileMutationManager.ts` - Added move/rename mutation paths and destination validation.
* `apps/server/tests/fileMutationManager.test.ts` - Covers successful move/rename and destination conflict failures.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T012 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T012 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - Move/rename scenarios passed.
  * Evidence: Test asserts source removal, destination content, same-directory rename, and destination conflict no-op.
* UI product-surface check: N/A - T012 changes backend manager behavior only.
* UI craft check: N/A - T012 changes no UI.

***

### Task T013 - Integrate Active File-Intent Conflict Checks

**Started**: 2026-06-28 17:00 **Completed**: 2026-06-28 17:06 **Duration**: 6 minutes

**Notes**:

* Integrated `FileIntentManager.checkConflicts` through an injected conflict checker.
* Mutations block on active conflicting intents unless `conflictOverride` is set or all conflict ids are listed as cleared.

**Files Changed**:

* `apps/server/src/managers/fileMutationManager.ts` - Added source and destination conflict checks.
* `apps/server/tests/fileMutationManager.test.ts` - Covers active conflict blocking and explicit override.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T013 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T013 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - File-intent conflict scenarios passed.
  * Evidence: Test asserts conflict response with `fileIntent: "conflict"`, no mutation, then successful override with `conflictIntentIds`.
* UI product-surface check: N/A - T013 changes backend manager behavior only.
* UI craft check: N/A - T013 changes no UI.

***

### Task T014 - Record Compact File Execution Runs

**Started**: 2026-06-28 17:00 **Completed**: 2026-06-28 17:06 **Duration**: 6 minutes

**Notes**:

* Added command-center execution run creation for file mutations and rollbacks with file-family executor kind mapping, safe target labels, result summaries, hashes, changed byte count, backup id, rollback state, and conflict count.
* Extended protocol execution attachments with `kind: "file"` and updated existing server call sites to narrow terminal/container attachments before reading family-specific fields.

**Files Changed**:

* `apps/server/src/managers/fileMutationManager.ts` - Added compact execution run recording.
* `packages/protocol/src/orchestrationCommandCenter.ts` - Added file execution attachment contract and parser.
* `apps/server/src/managers/taskExecutionCoordinator.ts` - Narrowed terminal attachment access by `kind`.
* `apps/server/src/routes/terminalContainers.ts` - Narrowed container attachment access by `kind`.
* `apps/server/tests/fileMutationManager.test.ts` - Covers compact execution evidence redaction.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T014 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T014 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts packages/protocol/tests/fileMutation.test.ts`
  * Result: PASS - 2 test files passed.
  * Evidence: 10/10 focused tests passed, including file execution attachment parsing and command-center event redaction assertions.
* Command/check: `npm --workspace apps/server run typecheck`
  * Result: PASS - Server TypeScript completed successfully.
  * Evidence: Existing terminal/container attachment call sites compile with explicit kind narrowing.
* UI product-surface check: N/A - T014 changes backend/protocol execution metadata only.
* UI craft check: N/A - T014 changes no UI.

**BQC Fixes**:

* Contract alignment: Updated attachment consumers to narrow the new union before accessing terminal or container fields (`apps/server/src/managers/taskExecutionCoordinator.ts`, `apps/server/src/routes/terminalContainers.ts`).
* Error information boundaries: File execution attachments exclude content, patch bodies, absolute paths, tokens, provider payloads, raw logs, stdout, and stderr (`apps/server/src/managers/fileMutationManager.ts`).

***

### Task T015 - Implement Rollback

**Started**: 2026-06-28 17:00 **Completed**: 2026-06-28 17:06 **Duration**: 6 minutes

**Notes**:

* Added rollback by backup id for write, edit, delete, move, and rename backups.
* Rollback is idempotent for repeated idempotency keys and already-rolled-back backups, reports missing backups, records safe rollback metadata, and updates backup rollback state.

**Files Changed**:

* `apps/server/src/managers/fileMutationManager.ts` - Added rollback request parsing integration, backup loading, restore logic, rollback state updates, and rollback execution evidence.
* `apps/server/tests/fileMutationManager.test.ts` - Covers rollback restore, duplicate rollback, and missing backup.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T015 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T015 complete.

**Verification**:

* Command/check: `npx vitest run apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - Rollback scenarios passed.
  * Evidence: Test asserts rollback restores prior content, duplicate rollback returns `duplicate: true`, and missing backup returns `404 not_found`.
* UI product-surface check: N/A - T015 changes backend rollback behavior only.
* UI craft check: N/A - T015 changes no UI.

***

### Task T004 - Add Protocol File Mutation Contracts

**Started**: 2026-06-28 16:58 **Completed**: 2026-06-28 17:00 **Duration**: 2 minutes

**Notes**:

* Added protocol-owned file mutation operation, result status, rollback state, request, rollback request, path metadata, backup metadata, rollback metadata, result, and file execution attachment contracts.
* Added schema-validated parsers for mutation requests/results, backups, rollback metadata, rollback requests, SHA-256 values, and compact file execution attachments.
* Kept request-scoped `content`, `search`, and `replacement` available only on mutation requests while result, backup, rollback, and attachment parsers reject broad raw file fields.

**Files Changed**:

* `packages/protocol/src/orchestrationCommandCenter.ts` - Added file mutation contracts, parser helpers, safe hash handling, and file execution attachment parsing.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T004 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T004 complete.

**Verification**:

* Command/check: `npx vitest run packages/protocol/tests/fileMutation.test.ts`
  * Result: PASS - 1 test file passed.
  * Evidence: `packages/protocol/tests/fileMutation.test.ts` passed 5/5 tests.
* UI product-surface check: N/A - T004 changes protocol contracts only.
* UI craft check: N/A - T004 changes no UI.

**BQC Fixes**:

* Trust boundary enforcement: Added explicit parser validation for safe repo-relative paths, expected SHA-256 values, request-scoped content bounds, rollback state vocabulary, and broad raw metadata rejection (`packages/protocol/src/orchestrationCommandCenter.ts`).

***

### Task T005 - Add Shared Protocol File Mutation Tests

**Started**: 2026-06-28 16:58 **Completed**: 2026-06-28 17:00 **Duration**: 2 minutes

**Notes**:

* Added shared protocol coverage for mutation parsing, safe path labels, expected hash requirements, compact result metadata, rollback metadata, file execution attachments, and raw content/patch rejection.
* Focused tests now pass against the protocol implementation.

**Files Changed**:

* `packages/protocol/tests/fileMutation.test.ts` - Added shared parser and metadata tests.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T005 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T005 complete.

**Verification**:

* Command/check: `npx vitest run packages/protocol/tests/fileMutation.test.ts`
  * Result: PASS - 1 test file passed.
  * Evidence: `packages/protocol/tests/fileMutation.test.ts` passed 5/5 tests covering operation vocabulary, request parsing, path/hash rejection, compact result metadata, rollback metadata, file attachment parsing, and broad raw metadata rejection.
* UI product-surface check: N/A - T005 changes protocol tests only.
* UI craft check: N/A - T005 changes no UI.

***

### Task T002 - Create Server File Mutation Acceptance Coverage

**Started**: 2026-06-28 16:52 **Completed**: 2026-06-28 16:57 **Duration**: 5 minutes

**Notes**:

* Added temp-directory acceptance coverage for read, preview, write, edit, delete, move, rename, rollback, duplicate idempotency, conflict, stale hash, backup failure, mutation compensation, path rejection, symlink escape rejection, generated and ignored path policy, destination conflicts, and redacted execution evidence.
* Tests define the intended `FileMutationManager.execute` and `FileMutationManager.rollback` API before implementation.

**Files Changed**:

* `apps/server/tests/fileMutationManager.test.ts` - Added server acceptance tests for the manager-level filesystem mutation contract.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T002 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T002 complete.

**Verification**:

* Command/check: `test -s apps/server/tests/fileMutationManager.test.ts && rg -n "reads, previews|rolls back|blocks stale|rejects unsafe|records compact" apps/server/tests/fileMutationManager.test.ts`
  * Result: PASS - Acceptance test file exists and contains the planned coverage groups.
  * Evidence: Output listed five Vitest cases covering mutation, rollback/idempotency, blocking/failure, unsafe paths, and redaction.
* UI product-surface check: N/A - T002 creates backend manager tests only.
* UI craft check: N/A - T002 changes no UI.

***

### Task T003 - Create Protocol File Mutation Acceptance Coverage

**Started**: 2026-06-28 16:57 **Completed**: 2026-06-28 16:58 **Duration**: 1 minute

**Notes**:

* Added protocol acceptance coverage for file mutation operation/result/rollback vocabularies, request parsing, expected hash requirements, safe path validation, backup/result metadata, rollback requests, file execution attachments, and blocked raw broad metadata.
* Tests intentionally allow request-scoped `content`, `search`, and `replacement` fields while rejecting blocked raw field names such as `fileContent`, `patch`, and `absolutePath`.

**Files Changed**:

* `packages/protocol/tests/fileMutation.test.ts` - Added protocol acceptance tests for file mutation contracts.
* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added T003 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T003 complete.

**Verification**:

* Command/check: `test -s packages/protocol/tests/fileMutation.test.ts && rg -n "parses scoped request|enforces safe paths|parses compact result|rejects raw" packages/protocol/tests/fileMutation.test.ts`
  * Result: PASS - Protocol test file exists and contains parser, safety, metadata, and blocked-field cases.
  * Evidence: Output listed four focused Vitest cases for request parsing, path/hash validation, compact result metadata, and broad raw metadata rejection.
* UI product-surface check: N/A - T003 creates protocol tests only.
* UI craft check: N/A - T003 changes no UI.

***

## Task Log

### 2026-06-28 - Session Start

**Environment verified**:

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

**Notes**:

* Spec-system analysis selected `phase20-session06-file-mutation-core` with `Package: null`, so this is a cross-cutting protocol and server session.
* Prerequisite checker passed for `.spec_system`, `jq`, `git`, and npm workspace tooling.
* Tool check passed for `node` and `npm`; current shell reports Node `v24.14.0` and npm `11.16.0` while project conventions require Node `26.2.0+`. Verification commands will record exact runtime output.
* BQC loaded because this session produces application code.

***

### Task T001 - Verify Session Baseline And File Executor Posture

**Started**: 2026-06-28 16:49 **Completed**: 2026-06-28 16:52 **Duration**: 3 minutes

**Notes**:

* Confirmed Session 01 validation records a PASS result and explicitly preserves file executors as `approved_not_executing`.
* Confirmed Session 05 validation records a PASS result and the phase sequence is complete through campaign DAG recovery.
* Inspected the current executor registry and tests to confirm file guarded actions still produce `not_executed` / `unavailable` results until Session 07 integration.

**Files Changed**:

* `.spec_system/specs/phase20-session06-file-mutation-core/implementation-notes.md` - Added session start evidence and T001 log.
* `.spec_system/specs/phase20-session06-file-mutation-core/tasks.md` - Marked T001 complete.

**Verification**:

* Command/check: `sed -n '1,240p' .spec_system/specs/phase20-session01-truthful-capability-baseline/validation.md`
  * Result: PASS - Session 01 validation report says `Result: PASS`.
  * Evidence: Validation summary states file capability remains `approved_not_executing` and file approvals produce `not_executed`.
* Command/check: `sed -n '1,220p' .spec_system/specs/phase20-session05-campaign-dag-recovery/validation.md`
  * Result: PASS - Session 05 validation report says `Result: PASS`.
  * Evidence: Validation summary states 24/24 tasks complete with passing focused, full, and quality gates.
* Command/check: `rg -n "approved_not_executing|file_write|file_edit|file_delete|file_move|file_read|executor_ready" apps/server/src/managers/executorRegistry.ts apps/server/tests/executorRegistry.test.ts apps/server/src/managers/orchestrationCommandCenter.ts apps/server/tests/commandCenterManager.test.ts .spec_system/specs/phase20-session01-truthful-capability-baseline .spec_system/specs/phase20-session05-campaign-dag-recovery`
  * Result: PASS - Current code and tests keep file executor capability unavailable for real execution.
  * Evidence: `executorRegistry.ts` file entries use `approved_not_executing`; `executorRegistry.test.ts` asserts file evaluation is not ready and returns `not_executed`.
* UI product-surface check: N/A - T001 is backend/session evidence only.
* UI craft check: N/A - T001 changes no UI.

***


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