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gsxdsm 33d4fa46c5 FN-8969: fix plan evidence version collisions

Prevent plan writes from permanently failing when durable and snapshot evidence versions diverge.

- Centralize conflict-tolerant plan-evidence appends with durable version allocation
- Reuse the helper for prompt, lineage, and project evidence writes
- Cover version drift, retry, deduplication, and concurrent PostgreSQL writes

Files changed:
 .../fn-8969-plan-evidence-version-collision.md     |  7 ++
 .../__tests__/plan-evidence-next-version.test.ts   | 49 ++++++++++++++
 .../plan-evidence-version-collision.pg.test.ts     | 72 ++++++++++++++++++++
 packages/core/src/store.ts                         | 40 ++++++-----
 .../core/src/task-store/async/async-lifecycle.ts   | 49 +++++++-------
 packages/core/src/task-store/plan-evidence.ts      | 77 ++++++++++++++++++++++
 packages/core/src/task-store/project-store-ops.ts  | 47 +++++++------
 7 files changed, 276 insertions(+), 65 deletions(-)

Fusion-Task-Id: FN-8969

Fusion-Task-Lineage: 5fba0bc8-bcf6-42ea-b617-3484919ed2fa

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

2026-08-10 19:43:13 -07:00