feat(FN-965): add per-task planning model override

- Add planningModelProvider and planningModelId fields to core Task type
- Update backend API validation to accept planning model fields on create/update
- Update frontend API client and TaskForm to handle planning model
- Add planning model selector row to ModelSelectorTab component
- Wire up planning model in TaskDetailModal edit mode with save support
- Update AGENTS.md with planning model override documentation
- Add comprehensive tests for ModelSelectorTab and API routes
- Bump schema version from 10 to 11

packages/core/src/db.test.ts

@@ -89,7 +89,7 @@ describe("Database", () => {
     });
 
     it("seeds schema version", () => {
-      expect(db.getSchemaVersion()).toBe(10);
+      expect(db.getSchemaVersion()).toBe(11);
     });
 
     it("seeds lastModified", () => {
@@ -112,7 +112,7 @@ describe("Database", () => {
 
     it("is idempotent - calling init() twice does not fail", () => {
       expect(() => db.init()).not.toThrow();
-      expect(db.getSchemaVersion()).toBe(10);
+      expect(db.getSchemaVersion()).toBe(11);
     });
 
     it("does not overwrite existing config on re-init", () => {
@@ -719,7 +719,7 @@ describe("schema migrations", () => {
     db.init();
 
     // Verify version bumped to 5 (includes v1→v2, v2→v3, v3→v4, and v4→v5 migrations)
-    expect(db.getSchemaVersion()).toBe(10);
+    expect(db.getSchemaVersion()).toBe(11);
 
     // Verify new columns exist and existing data is intact
     const cols = db.prepare("PRAGMA table_info(tasks)").all() as Array<{ name: string }>;
@@ -744,11 +744,11 @@ describe("schema migrations", () => {
     const db = new Database(kbDir);
     db.init();
 
-    expect(db.getSchemaVersion()).toBe(10);
+    expect(db.getSchemaVersion()).toBe(11);
 
     // Re-init should not fail
     db.init();
-    expect(db.getSchemaVersion()).toBe(10);
+    expect(db.getSchemaVersion()).toBe(11);
 
     db.close();
   });
@@ -843,7 +843,7 @@ describe("schema migrations", () => {
     db.init();
 
     // Verify version bumped to 5
-    expect(db.getSchemaVersion()).toBe(10);
+    expect(db.getSchemaVersion()).toBe(11);
 
     // Verify new columns exist and existing data is intact
     const cols = db.prepare("PRAGMA table_info(tasks)").all() as Array<{ name: string }>;
@@ -1053,7 +1053,7 @@ describe("createDatabase factory", () => {
     const db = createDatabase(kbDir);
     db.init();
 
-    expect(db.getSchemaVersion()).toBe(10);
+    expect(db.getSchemaVersion()).toBe(11);
     expect(db.getLastModified()).toBeGreaterThan(0);
 
     db.close();