Introduce `update_target_stars`, `get_target_owner_uid`, and `VOTABLE_TARGETS`/`STAR_TARGETS` in database.py; replace inline badge insertion with `award_badge()` and inline notification creation with `create_notification()` across auth, comments, and follow routers; add `enrich_items()` in new content module to centralize post/gist list assembly and remove duplicated enrichment logic from feed and gists routers.
- Add .dockerignore, Dockerfile, and docker compose targets to Makefile for containerized deployment
- Implement gists router with CRUD operations, database schema, and polymorphic comment/vote reuse
- Create attachment upload system with thumbnail generation, MIME detection, and storage path management
- Add attachments_prune CLI command to clean orphaned attachment records and files
- Introduce rate limiting middleware with 60 requests per minute window
- Add custom 404 and 500 error handlers with SEO-optimized template responses
- Extend database initialization with gists and attachments indexes plus upload site settings defaults
- Update load_comments to include attachment mapping for comment resources
- Register gists and uploads routers in main application and update AGENTS.md documentation
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