## Summary
Re-lands the completed Fusion board task FX-005 on current upstream
`main`, stacked on #2374 (FX-004).
- adds a narrowly authorized additive publication path for archived task
documents
- preserves archived task and mission state and keeps ordinary
replacement/deletion writes rejected
- exposes retained archived current/revision reads
- requires project-scoped revision/hash CAS for publication
- maps malformed, unauthorized, missing, inconsistent, and stale states
safely
- rebases preserved dashboard drafts explicitly after CAS conflicts
## Why
Operators need to append a correction or evidence revision to an
archived task without unarchiving it or weakening ordinary archived-task
immutability.
## Dependency
This branch contains #2374 plus the eight FX-005 commits because
cross-fork PRs cannot target a fork-only base branch. After #2374 lands,
this PR should be rebased or refreshed so its diff collapses to FX-005
only.
## Validation
- PostgreSQL task-store and archived-default suites: 33/33
- dashboard route and editor suites: 321/321
- agent document tools: 22/22
- core, dashboard, and engine typechecks pass
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added optimistic concurrency controls for task document creation and
editing using revisions and content hashes.
* Added safe, authenticated append-only corrections for documents
retained on archived tasks.
* Archived documents and revision history remain available for direct
reading.
* Agent and dashboard tools now report conflicts clearly and support
explicit draft rebasing.
* **Bug Fixes**
* Prevented stale updates from overwriting newer document content.
* Preserved archived-task immutability while allowing controlled
corrections.
* **Documentation**
* Updated CLI, dashboard, storage, task-management, and agent guidance
for these workflows.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: fusion-merge-train <merge-train@topkoli.local>
Co-authored-by: Fusion <noreply@runfusion.ai>
Co-authored-by: v <v@v.speedport.ip>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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