feat(FN-2991): merge fusion/fn-2991

Commits merged:
- fix(FN-2991): align failed research status badge semantics
- feat(FN-2991): add research dashboard view and navigation entry
- fix(FN-2991): complete Step 8 — resolve lint and typecheck gates
- test(FN-2991): address review feedback for Step 7
- test(FN-2991): complete Step 7 — add research store and route tests
- feat(FN-2991): complete Step 6 — add research client API helpers
- feat(FN-2991): complete Step 5 — add research REST routes
- feat(FN-2991): complete Step 4 — wire research store into core exports
- feat(FN-2991): complete Step 3 — implement research store
- feat(FN-2991): complete Step 2 — add research schema and migration
- feat(FN-2991): complete Step 1 — add research domain types

Files changed:
packages/core/src/__tests__/db.test.ts             |  26 +-
 packages/core/src/__tests__/insight-store.test.ts  |   8 +-
 packages/core/src/__tests__/mission-store.test.ts  |   2 +-
 packages/core/src/__tests__/research-store.test.ts | 118 +++++++
 packages/core/src/__tests__/roadmap-store.test.ts  |   2 +-
 packages/core/src/__tests__/run-audit.test.ts      |   2 +-
 packages/core/src/__tests__/task-documents.test.ts |   2 +-
 packages/core/src/db.ts                            |  82 ++++-
 packages/core/src/index.ts                         |  30 ++
 packages/core/src/research-store.ts                | 377 +++++++++++++++++++++
 packages/core/src/research-types.ts                | 162 +++++++++
 packages/core/src/store.ts                         |  14 +
 packages/dashboard/app/App.tsx                     |  12 +
 .../app/api/__tests__/research-api.test.ts         | 120 +++++++
 packages/dashboard/app/api/legacy.ts               | 132 +++++++-
 packages/dashboard/app/components/Header.tsx       |  23 +-
 packages/dashboard/app/components/MobileNavBar.tsx |  16 +-
 packages/dashboard/app/components/ResearchView.css | 110 ++++++
 packages/dashboard/app/components/ResearchView.tsx | 145 ++++++++
 .../app/components/__tests__/Header.test.tsx       |   4 +-
 .../app/components/__tests__/ResearchView.test.tsx | 170 ++++++++++
 packages/dashboard/app/hooks/useViewState.ts       |   3 +-
 packages/dashboard/src/research-routes.ts          | 223 ++++++++++++
 .../src/routes/register-integrated-routers.ts      |   2 +
 24 files changed, 1751 insertions(+), 34 deletions(-)

Fusion-Task-Id: FN-2991

packages/core/src/db.ts

@@ -86,7 +86,7 @@ export function probeFts5(db: DatabaseSync): boolean {
 
 // ── Schema Definition ────────────────────────────────────────────────
 
-const SCHEMA_VERSION = 54;
+const SCHEMA_VERSION = 55;
 
 function normalizeTaskComments(
   steeringComments: SteeringComment[] | undefined,
@@ -411,6 +411,41 @@ CREATE TABLE IF NOT EXISTS task_document_revisions (
 );
 CREATE INDEX IF NOT EXISTS idxTaskDocumentRevisionsTaskKey ON task_document_revisions(taskId, key);
 
+-- Research runs persistence (FN-2991)
+CREATE TABLE IF NOT EXISTS research_runs (
+  id TEXT PRIMARY KEY,
+  query TEXT NOT NULL,
+  topic TEXT,
+  status TEXT NOT NULL,
+  providerConfig TEXT,
+  sources TEXT NOT NULL DEFAULT '[]',
+  events TEXT NOT NULL DEFAULT '[]',
+  results TEXT,
+  error TEXT,
+  tokenUsage TEXT,
+  tags TEXT NOT NULL DEFAULT '[]',
+  metadata TEXT,
+  createdAt TEXT NOT NULL,
+  updatedAt TEXT NOT NULL,
+  startedAt TEXT,
+  completedAt TEXT,
+  cancelledAt TEXT
+);
+CREATE INDEX IF NOT EXISTS idxResearchRunsStatus ON research_runs(status);
+CREATE INDEX IF NOT EXISTS idxResearchRunsCreatedAt ON research_runs(createdAt);
+CREATE INDEX IF NOT EXISTS idxResearchRunsUpdatedAt ON research_runs(updatedAt);
+
+CREATE TABLE IF NOT EXISTS research_exports (
+  id TEXT PRIMARY KEY,
+  runId TEXT NOT NULL,
+  format TEXT NOT NULL,
+  content TEXT NOT NULL,
+  filePath TEXT,
+  createdAt TEXT NOT NULL,
+  FOREIGN KEY (runId) REFERENCES research_runs(id) ON DELETE CASCADE
+);
+CREATE INDEX IF NOT EXISTS idxResearchExportsRunId ON research_exports(runId);
+
 -- Schema version tracking
 CREATE TABLE IF NOT EXISTS __meta (
   key TEXT PRIMARY KEY,
@@ -1999,6 +2034,51 @@ export class Database {
       });
     }
 
+    // Research runs + exports persistence tables (FN-2991).
+    if (version < 55) {
+      this.applyMigration(55, () => {
+        this.db.exec(`
+          CREATE TABLE IF NOT EXISTS research_runs (
+            id TEXT PRIMARY KEY,
+            query TEXT NOT NULL,
+            topic TEXT,
+            status TEXT NOT NULL,
+            providerConfig TEXT,
+            sources TEXT NOT NULL DEFAULT '[]',
+            events TEXT NOT NULL DEFAULT '[]',
+            results TEXT,
+            error TEXT,
+            tokenUsage TEXT,
+            tags TEXT NOT NULL DEFAULT '[]',
+            metadata TEXT,
+            createdAt TEXT NOT NULL,
+            updatedAt TEXT NOT NULL,
+            startedAt TEXT,
+            completedAt TEXT,
+            cancelledAt TEXT
+          )
+        `);
+
+        this.db.exec(`CREATE INDEX IF NOT EXISTS idxResearchRunsStatus ON research_runs(status)`);
+        this.db.exec(`CREATE INDEX IF NOT EXISTS idxResearchRunsCreatedAt ON research_runs(createdAt)`);
+        this.db.exec(`CREATE INDEX IF NOT EXISTS idxResearchRunsUpdatedAt ON research_runs(updatedAt)`);
+
+        this.db.exec(`
+          CREATE TABLE IF NOT EXISTS research_exports (
+            id TEXT PRIMARY KEY,
+            runId TEXT NOT NULL,
+            format TEXT NOT NULL,
+            content TEXT NOT NULL,
+            filePath TEXT,
+            createdAt TEXT NOT NULL,
+            FOREIGN KEY (runId) REFERENCES research_runs(id) ON DELETE CASCADE
+          )
+        `);
+
+        this.db.exec(`CREATE INDEX IF NOT EXISTS idxResearchExportsRunId ON research_exports(runId)`);
+      });
+    }
+
   }
 
   /**