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gsxdsm 65bf3097ff FN-8857: invalidate stale task dispatch routes

Clear persisted effective routes whenever an eligible task node override changes.

- Add route invalidation logic that preserves checkout-bound and explicit replacement routes.
- Cover in-memory and PostgreSQL task-update scenarios, including partial snapshot replacements.
- Document the dispatch snapshot invalidation behavior and add a patch changeset.

Files changed:
 .changeset/fn-8857-stale-effective-route.md        |   7 +
 docs/architecture.md                               |   6 +-
 docs/task-management.md                            |   4 +-
 .../__tests__/effective-route-invalidation.test.ts | 101 ++++++++++++++
 .../postgres/task-node-override.pg.test.ts         |  63 +++++++++
 ...ask-update-effective-route-invalidation.test.ts | 148 +++++++++++++++++++++
 packages/core/src/index.ts                         |   5 +
 .../core/src/mesh/effective-route-invalidation.ts  |  58 ++++++++
 packages/core/src/task-store/task-update.ts        |  40 ++++++
 9 files changed, 428 insertions(+), 4 deletions(-)

Fusion-Task-Id: FN-8857

Fusion-Task-Lineage: ab6c1a40-70b4-4501-ab34-771de288da10

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

2026-08-08 23:05:29 -07:00