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.

tests/integration/hooks.test.js

@@ -692,10 +692,11 @@ async function runTests() {
 
           const isInline = hook.command.startsWith('node -e');
           const isFilePath = hook.command.startsWith('node "');
+          const isShellScript = hook.command.endsWith('.sh');
 
           assert.ok(
-            isInline || isFilePath,
-            `Hook command in ${hookType} should be inline (node -e) or file path (node "), got: ${hook.command.substring(0, 50)}`
+            isInline || isFilePath || isShellScript,
+            `Hook command in ${hookType} should be inline (node -e), file path (node "), or shell script (.sh), got: ${hook.command.substring(0, 80)}`
           );
         }
       }