Adds an AI-undo fallback to the revert route: when a git-based revert conflicts or is unsupported, an ordinary board task is created to perform the undo via AI instead of a forced/failed git write.
- POST /tasks/:id/revert now accepts an optional `{ mode?: "git" | "ai" | "auto" }` body (default "auto"); unknown values reject with 400.
- "git" preserves the FN-7523 git-only contract unchanged; "ai" always creates the AI-undo task; "auto" tries git first and falls back to AI only on a conflicting or unsupported (e.g. workspace) result — needsHuman (autoMerge:false) never triggers the fallback.
- New engine helpers in task-revert.ts: `createAiUndoTask`, `buildAiUndoTaskDescription`, `REVERT_OF_METADATA_KEY`, plus `AiUndoTaskResult`/`CreateAiUndoTaskDeps` types, exported from packages/engine/src/index.ts.
- The AI-undo task is created via the normal triage-column `store.createTask` path with no dependency on the source task, referencing the source task's mission, id, and landed files, and instructing an undo commit using the `revert(FN-xxxx): ...` convention.
- New core `TaskStore.findOpenRevertTaskForSource` backs an idempotency guard: a repeated call while an AI-undo task is still open returns the same `createdTaskId` with `alreadyOpen: true` instead of creating a duplicate.
- Updated docs/task-management.md's revert section to document the git path + AI-undo fallback contract.
- Added a minor changeset for the @runfusion/fusion release notes.
- Added/extended tests: packages/engine/src/__tests__/task-revert-ai-undo.test.ts (new) and packages/dashboard/src/__tests__/task-revert-route.test.ts (extended) covering mode validation, auto-fallback-on-conflict, forced "ai" mode, and the duplicate-open-task guard.
Files changed:
.changeset/fn-7524-ai-undo-revert.md | 7 +
docs/task-management.md | 13 +-
packages/core/src/store.ts | 31 +++++
packages/dashboard/src/__tests__/task-revert-route.test.ts | 143 ++++++++++++++++++++-
packages/dashboard/src/routes/register-task-workflow-routes.ts | 75 +++++++++--
packages/engine/src/__tests__/task-revert-ai-undo.test.ts | 114 ++++++++++++++++
packages/engine/src/index.ts | 5 +
packages/engine/src/task-revert.ts | 117 ++++++++++++++++-
8 files changed, 487 insertions(+), 18 deletions(-)
Fusion-Task-Id: FN-7524
Fusion-Task-Lineage: 64dfedcf-c286-4c46-8cf8-51ec5e668bf7
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>
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