feat(skills): target watcher updates with safe fallback

src/daemon/services.test.ts

@@ -16,10 +16,10 @@ describe('initSkills watcher wiring', () => {
     }
   });
 
-  function writeSkill(rootDir: string, name: string): void {
+  function writeSkill(rootDir: string, name: string, instructions = `# ${name}\n\nTest skill.`): void {
     const skillDir = join(rootDir, name);
     mkdirSync(skillDir, { recursive: true });
-    writeFileSync(join(skillDir, 'SKILL.md'), `# ${name}\n\nTest skill.`);
+    writeFileSync(join(skillDir, 'SKILL.md'), instructions);
   }
 
   function makeConfig(overrides: Record<string, unknown> = {}) {
@@ -62,7 +62,7 @@ describe('initSkills watcher wiring', () => {
     expect(result.skillsWatcher?.isRunning).toBe(false);
   });
 
-  it('reloads registry from disk when watcher callback fires', () => {
+  it('applies targeted add/update changes for a mapped skill path', () => {
     vi.useFakeTimers();
     const root = mkdtempSync(join(tmpdir(), 'flynn-services-'));
     roots.push(root);
@@ -85,7 +85,35 @@ describe('initSkills watcher wiring', () => {
     writeSkill(managedDir, 'beta');
     result.skillsWatcher?.notifyPathChanged(join(managedDir, 'beta', 'SKILL.md'));
     vi.advanceTimersByTime(20);
+    expect(result.skillRegistry.get('beta')).toBeDefined();
 
+    writeSkill(managedDir, 'beta', '# beta\n\nUpdated instructions.');
+    result.skillsWatcher?.notifyPathChanged(join(managedDir, 'beta', 'SKILL.md'));
+    vi.advanceTimersByTime(20);
+    expect(result.skillRegistry.get('beta')?.instructions).toContain('Updated instructions.');
+
+    result.skillsWatcher?.stop();
+  });
+
+  it('unregisters a removed mapped skill path', () => {
+    vi.useFakeTimers();
+    const root = mkdtempSync(join(tmpdir(), 'flynn-services-'));
+    roots.push(root);
+    const managedDir = join(root, 'skills');
+    mkdirSync(managedDir, { recursive: true });
+    writeSkill(managedDir, 'alpha');
+    writeSkill(managedDir, 'beta');
+
+    const config = makeConfig({
+      skills: {
+        managed_dir: managedDir,
+        load: { watch: true, watch_debounce_ms: 20 },
+      },
+    });
+    const lifecycle = new Lifecycle();
+
+    const result = initSkills(config, lifecycle);
+    expect(result.skillRegistry.get('alpha')).toBeDefined();
     expect(result.skillRegistry.get('beta')).toBeDefined();
 
     rmSync(join(managedDir, 'alpha'), { recursive: true, force: true });
@@ -97,4 +125,32 @@ describe('initSkills watcher wiring', () => {
 
     result.skillsWatcher?.stop();
   });
+
+  it('falls back to full reload for ambiguous paths', () => {
+    vi.useFakeTimers();
+    const root = mkdtempSync(join(tmpdir(), 'flynn-services-'));
+    roots.push(root);
+    const managedDir = join(root, 'skills');
+    mkdirSync(managedDir, { recursive: true });
+    writeSkill(managedDir, 'alpha');
+
+    const config = makeConfig({
+      skills: {
+        managed_dir: managedDir,
+        load: { watch: true, watch_debounce_ms: 20 },
+      },
+    });
+    const lifecycle = new Lifecycle();
+
+    const result = initSkills(config, lifecycle);
+    expect(result.skillRegistry.get('alpha')).toBeDefined();
+    expect(result.skillRegistry.get('beta')).toBeUndefined();
+
+    writeSkill(managedDir, 'beta');
+    result.skillsWatcher?.notifyPathChanged(join(root, 'not-a-skill-path'));
+    vi.advanceTimersByTime(20);
+
+    expect(result.skillRegistry.get('beta')).toBeDefined();
+    result.skillsWatcher?.stop();
+  });
 });