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gsxdsm 4009eb34cb FN-8683: remove unreachable SQLite task polling replica

Document PostgreSQL task-deletion observation and remove the obsolete SQLite polling path.

- Remove polling state, replica emissions, and activity-log suppression from TaskStore.
- Retain backend-aware cache warming while documenting the transactional-outbox follow-up.
- Add tombstone and soft-delete abort coverage across core and engine lanes.

Files changed:
 docs/architecture.md                               |   3 +-
 ...tgres-cross-process-task-deleted-observation.md | 128 ++++++++++++++++
 docs/storage.md                                    |   3 +-
 .../task-delete-nonblocking-cleanup.test.ts        |  54 +++++++
 .../task-deleted-polling-replica-tombstone.test.ts |  57 +++++++
 .../task-updated-lanes-emit-surfaces.test.ts       |  26 ----
 packages/core/src/store.ts                         |  13 +-
 packages/core/src/task-store/lifecycle-ops.ts      | 168 ++-------------------
 packages/core/src/task-store/task-artifacts-ops.ts |   4 -
 .../__tests__/executor-soft-delete-abort.test.ts   |  15 ++
 .../src/__tests__/triage-soft-delete-abort.test.ts |  14 ++
 11 files changed, 284 insertions(+), 201 deletions(-)

Fusion-Task-Id: FN-8683
Fusion-Task-Lineage: a052db0c-b6fc-4b05-b6b2-f8217b56ded0
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-01 03:24:36 -07:00