FN-5911: move agent logs to per-task JSONL storage

Store agent logs in per-task JSONL files instead of the legacy SQLite table.

- add a file-backed agent log store with JSONL append/read/prune helpers and task-scoped source refs
- migrate legacy SQLite agentLogEntries data into task files, rewrite goal citation references, and preserve soft-deleted logs for forensics
- update task store, settings, docs, dashboard route coverage, and add regression tests for migration, retention, and log access

Files changed:
 .changeset/fn-5911-agent-log-jsonl.md              |   5 +
 AGENTS.md                                          |   2 +-
 docs/diagnostics.md                                |   2 +-
 docs/settings-reference.md                         |   2 +
 docs/soft-delete-verification-matrix.md            |   7 +-
 docs/storage.md                                    |   8 +-
 .../src/__tests__/agent-log-file-store.test.ts     | 123 ++++++
 .../core/src/__tests__/agent-log-migration.test.ts | 186 +++++++++
 .../core/src/__tests__/agent-log-retention.test.ts | 208 ++++++++++
 packages/core/src/__tests__/db-migrate.test.ts     |  14 +-
 packages/core/src/__tests__/db.test.ts             |  39 +-
 .../src/__tests__/goal-citations-store.test.ts     |  38 +-
 packages/core/src/__tests__/goals-schema.test.ts   |   2 +-
 packages/core/src/__tests__/insight-store.test.ts  |  10 +-
 .../src/__tests__/merge-request-record.test.ts     |   2 +-
 packages/core/src/__tests__/mission-store.test.ts  |   2 +-
 packages/core/src/__tests__/run-audit.test.ts      |   2 +-
 packages/core/src/__tests__/secrets-schema.test.ts |   6 +-
 .../src/__tests__/soft-delete-agent-logs.test.ts   |  71 ++--
 .../src/__tests__/store-agent-log-file.test.ts     |  91 +++++
 .../core/src/__tests__/store-merge-queue.test.ts   |   2 +-
 packages/core/src/__tests__/store-test-helpers.ts  |  43 +-
 packages/core/src/__tests__/store-upsert.test.ts   |  37 +-
 packages/core/src/__tests__/task-documents.test.ts |   2 +-
 packages/core/src/agent-log-constants.ts           |  25 ++
 packages/core/src/agent-log-file-store.ts          | 267 ++++++++++++
 packages/core/src/db.ts                            |  51 ++-
 packages/core/src/settings-schema.ts               |   1 +
 packages/core/src/store.ts                         | 453 ++++++++++++---------
 packages/core/src/types.ts                         |  10 +-
 .../__tests__/agent-log-routes.integration.test.ts |  48 +++
 .../src/__tests__/evaluator-evidence.test.ts       |  47 ++-
 packages/engine/src/self-healing.ts                |  12 +
 .../src/store/__tests__/roadmap-store.test.ts      |   4 +-
 34 files changed, 1477 insertions(+), 345 deletions(-)

Fusion-Task-Id: FN-5911

Fusion-Task-Lineage: 07c42f3a-87cf-4558-8f01-ac8460b5558b

plugins/fusion-plugin-roadmap/src/store/__tests__/roadmap-store.test.ts

@@ -743,8 +743,8 @@ describe("RoadmapStore", () => {
   });
 
   describe("schema version", () => {
-    it("schema version is 100 after init", () => {
-      expect(db.getSchemaVersion()).toBe(101);
+    it("schema version is 102 after init", () => {
+      expect(db.getSchemaVersion()).toBe(102);
     });
   });