chore: clean up repo by removing files that should be gitignored

Remove tracked files that belong in .gitignore:
- docs/ (internal planning documents, not official Documentation/)
- claudedocs/ (draft ADRs, superseded by Documentation/Developer/Adr/)
- .conformance-reports/ (generated reports)
- package-lock.json (not needed for TYPO3 extensions)

Add .gitleaks.toml to allowlist false positives in:
- Tests/Unit/Service/SecretDetectionServiceTest.php (fake API keys for
  testing the secret detection service itself)
- .php-cs-fixer.cache (file content hashes in git history)

Update .gitignore with new entries for the above paths.

Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>

Author: CybotTM

.conformance-reports/conformance_20260109_123155.md

@@ -9,17 +9,23 @@
 .DS_Store
 Thumbs.db
 
-# Build artifacts (future)
+# Build artifacts
 /vendor/
 /var/
 /.Build/
 /public/
 composer.lock
+package-lock.json
 
 # Rust (future)
 /rust/target/
 *.so
 
+# Generated / internal docs
+/docs/
+/claudedocs/
+/.conformance-reports/
+
 # Testing
 /.phpunit.result.cache
 /coverage/

.gitignore

@@ -0,0 +1,9 @@
+[extend]
+useDefault = true
+
+[allowlist]
+description = "Allow test fixtures and build cache false positives"
+paths = [
+    '''Tests/Unit/Service/SecretDetectionServiceTest\.php''',
+    '''\.php-cs-fixer\.cache''',
+]