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>

skills-engine/__tests__/uninstall.test.ts

@@ -203,16 +203,14 @@ describe('uninstall', () => {
     setupSkillPackage('telegram', {
       adds: { 'src/telegram.ts': 'tg code\n' },
       modifies: {
-        'src/config.ts':
-          'telegram import\nline1\nline2\nline3\nline4\nline5\n',
+        'src/config.ts': 'telegram import\nline1\nline2\nline3\nline4\nline5\n',
       },
     });
 
     setupSkillPackage('discord', {
       adds: { 'src/discord.ts': 'dc code\n' },
       modifies: {
-        'src/config.ts':
-          'line1\nline2\nline3\nline4\nline5\ndiscord import\n',
+        'src/config.ts': 'line1\nline2\nline3\nline4\nline5\ndiscord import\n',
       },
     });