refactor: CI optimization, logging improvements, and codebase formatting (#456)

* fix(db): remove unique constraint on folder to support multi-channel agents

* ci: implement automated skill drift detection and self-healing PRs

* fix: align registration logic with Gavriel's feedback and fix build/test issues from Daniel Mi

* style: conform to prettier standards for CI validation

* test: fix branch naming inconsistency in CI (master vs main)

* fix(ci): robust module resolution by removing file extensions in scripts

* refactor(ci): simplify skill validation by removing redundant combination tests

* style: conform skills-engine to prettier, unify logging in index.ts and cleanup unused imports

* refactor: extract multi-channel DB changes to separate branch

Move channel column, folder suffix logic, and related migrations
to feat/multi-channel-db-v2 for independent review. This PR now
contains only CI/CD optimizations, Prettier formatting, and
logging improvements.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/formatting.test.ts

@@ -69,7 +69,12 @@ describe('formatMessages', () => {
 
   it('formats multiple messages', () => {
     const msgs = [
-      makeMsg({ id: '1', sender_name: 'Alice', content: 'hi', timestamp: 't1' }),
+      makeMsg({
+        id: '1',
+        sender_name: 'Alice',
+        content: 'hi',
+        timestamp: 't1',
+      }),
       makeMsg({ id: '2', sender_name: 'Bob', content: 'hey', timestamp: 't2' }),
     ];
     const result = formatMessages(msgs);
@@ -154,9 +159,7 @@ describe('stripInternalTags', () => {
 
   it('strips multiple internal tag blocks', () => {
     expect(
-      stripInternalTags(
-        '<internal>a</internal>hello<internal>b</internal>',
-      ),
+      stripInternalTags('<internal>a</internal>hello<internal>b</internal>'),
     ).toBe('hello');
   });