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__/update-core-cli.test.ts

@@ -4,7 +4,12 @@ import path from 'path';
 import { afterEach, beforeEach, describe, expect, it } from 'vitest';
 import { stringify } from 'yaml';
 
-import { cleanup, createTempDir, initGitRepo, setupNanoclawDir } from './test-helpers.js';
+import {
+  cleanup,
+  createTempDir,
+  initGitRepo,
+  setupNanoclawDir,
+} from './test-helpers.js';
 
 describe('update-core.ts CLI flags', () => {
   let tmpDir: string;
@@ -101,11 +106,12 @@ describe('update-core.ts CLI flags', () => {
       'package.json': JSON.stringify({ version: '2.0.0' }),
     });
 
-    const stdout = execFileSync(
-      tsxBin,
-      [scriptPath, '--json', newCoreDir],
-      { cwd: tmpDir, encoding: 'utf-8', stdio: 'pipe', timeout: 30_000 },
-    );
+    const stdout = execFileSync(tsxBin, [scriptPath, '--json', newCoreDir], {
+      cwd: tmpDir,
+      encoding: 'utf-8',
+      stdio: 'pipe',
+      timeout: 30_000,
+    });
 
     const result = JSON.parse(stdout);