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gsxdsm 2fd214b4f2 FN-5975: extend archive FTS maintenance coverage

Add archive-database FTS maintenance and document the expanded compaction policy.

- add archive FTS maintenance helpers for optimize, rebuild, size measurement, and row counts
- extend self-healing maintenance to compact and rebuild archived_tasks_fts on a slower archive-specific cadence
- cover archive FTS maintenance with new core and engine tests and update architecture/storage docs

Files changed:
 docs/architecture.md                               |   2 +-
 docs/storage.md                                    |  12 +-
 .../__tests__/archive-db-fts-maintenance.test.ts   | 221 +++++++++++++++++++++
 packages/core/src/archive-db.ts                    |  61 +++++-
 packages/core/src/db.ts                            |  21 +-
 packages/core/src/store.ts                         |  20 ++
 .../src/__tests__/fts-maintenance-archive.test.ts  | 207 +++++++++++++++++++
 packages/engine/src/self-healing.ts                |  80 ++++++++
 8 files changed, 608 insertions(+), 16 deletions(-)

Fusion-Task-Id: FN-5975

Fusion-Task-Lineage: 13645c8c-3126-4d1b-af23-7cab1a8bb276

2026-06-08 10:33:16 -07:00