fix: resolve CI failures on main — lint, hooks validator, and test alignment

- Fix MD012 trailing blank lines in commands/projects.md and commands/promote.md
- Fix MD050 strong-style in continuous-learning-v2 (escape __tests__ as inline code)
- Extract doc-file-warning hook to standalone script to fix hooks validator regex parsing
- Update session-end test to match #317 behavior (always update summary content)
- Allow shell script hooks in integration test format validation

All 992 tests passing.

hooks/hooks.json

@@ -37,7 +37,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "node -e \"let d='';process.stdin.on('data',c=>d+=c);process.stdin.on('end',()=>{try{const i=JSON.parse(d);const p=i.tool_input?.file_path||'';if(/\\.(md|txt)$/.test(p)&&!/(README|CLAUDE|AGENTS|CONTRIBUTING|CHANGELOG|LICENSE|SKILL)\\.md$/i.test(p)&&!/\\.claude[\\/\\\\]plans[\\/\\\\]/.test(p)&&!/(^|[\\/\\\\])(docs|skills)[\\/\\\\]/.test(p)){console.error('[Hook] WARNING: Non-standard documentation file detected');console.error('[Hook] File: '+p);console.error('[Hook] Consider consolidating into README.md or docs/ directory')}}catch{}console.log(d)})\""
+            "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/doc-file-warning.js\""
           }
         ],
         "description": "Doc file warning: warn about non-standard documentation files (exit code 0; warns only)"