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gsxdsm 1372218b1f FN-9047: invalidate stale workspace landing proof after revert

Preserve workspace landing attribution while allowing cleanly reverted work to land again.

- Record a per-repository revert boundary after clean git-mode workspace reverts.
- Reject recorded and trailer landing proof at or behind that boundary, then clear it on a fresh landing.
- Persist boundaries through the revert route and cover re-land behavior with git tests.

Files changed:
 .changeset/fn-9047-workspace-revert-landed-sha.md  |  7 +++
 docs/architecture.md                               |  2 +
 packages/core/src/types/task/task-core.ts          |  7 ++-
 .../src/routes/register-session-diff-routes.ts     |  2 +-
 .../src/routes/register-task-workflow-routes.ts    | 11 ++++
 .../task-revert.workspace.real-git.test.ts         | 27 ++++++++++
 ...orkspace-land-predicate.revert-boundary.test.ts | 60 ++++++++++++++++++++++
 packages/engine/src/execution/task-revert.ts       | 42 +++++++++++++--
 packages/engine/src/index.ts                       |  1 +
 packages/engine/src/merge/merger-ai.ts             |  5 +-
 .../engine/src/merge/workspace-land-predicate.ts   | 25 +++++++--
 packages/engine/src/self-healing.ts                |  9 +++-
 12 files changed, 185 insertions(+), 13 deletions(-)

Fusion-Task-Id: FN-9047

Fusion-Task-Lineage: 8ac41347-3c76-4f54-8d69-f16f82084305

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-15 00:02:52 -07:00