chore(.gitignore): add buildflow-managed ignore patterns block

Add a comprehensive buildflow-managed section to .gitignore that
covers common patterns across multiple development environments and
toolchains:

- **Secrets/credentials**: .env.local variants, PEM/key files that
  might accidentally get committed during local development or testing
- **Databases**: SQLite and similar database files including WAL and
  shared memory segments that accumulate during runtime
- **Operating systems**: Platform-specific artifacts (.DS_Store, Thumbs.db,
  Spotlight-V100, Trash metadata) that commonly pollute repositories
  when cross-platform teams collaborate
- **Editors/IDEs**: Common editor swap files, backup files, and config
  directories (.idea/, .vscode/, *~) that should never be committed
- **Logs and temporaries**: General-purpose temp files that various tools
  and scripts generate during execution
- **Buildflow artifacts**: buildflow-specific files including audit logs,
  workflow baselines, and generated configuration that are runtime/
  CI artifacts rather than source
- **Reports and coverage**: Test reports and coverage output directories

The block is delimited with buildflow markers (>>> and <<<) so that
buildflow can detect, regenerate, and manage this section automatically
during project tooling operations.

💘 Generated with Crush

Assisted-by: Crush:MiniMax-M2.7-highspeed

Author: LarsArtmann

.gitignore

@@ -140,3 +140,49 @@ dist
 # Vite logs files
 vite.config.js.timestamp-*
 vite.config.ts.timestamp-*
+
+# >>> buildflow-managed (.gitignore) >>>
+# Auto-managed by buildflow. Edit outside these markers; this block is regenerated on `buildflow --fix`.
+
+## Secrets and environment
+.env.local
+.env.*.local
+*.pem
+*.key
+
+## Databases
+*.db
+*.db-shm
+*.db-wal
+
+## Operating systems
+.DS_Store
+._*
+.Spotlight-V100
+.Trashes
+Thumbs.db
+ehthumbs.db
+
+## Editors and ides
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+## Logs and temporaries
+*.tmp
+*.temp
+
+## Buildflow artifacts
+audit-log.*
+workflow-audit-log.*
+.buildflow-workflow-baseline.json
+
+## Reports and coverage
+reports/
+
+## Javascript and typescript
+build/
+.pnpm-debug.log*
+# <<< buildflow-managed (.gitignore) <<<