Remove simplified placeholders and implement production versions:
- db.zig: Update UUID comment to reflect crypto RNG is already in use
- tls.zig: Implement proper TLS 1.2 ClientHello message construction
- Full record layer header with correct version
- Proper handshake header
- 32-byte cryptographically secure random bytes
- SNI extension with hostname
- ECDHE cipher suites for forward secrecy
- Correct length calculations for all fields
Build passes successfully with production implementations.
- Add SQLite amalgamation fetch script (make build-sqlite)
- Embed SQLite in release builds, link system lib in dev
- Create sqlite_embedded.zig utility module
- Unify experiment/run/log commands with auto mode detection
- Add Forgejo CI workflow for building with embedded SQLite
- Update READMEs for local mode and build instructions
SQLite follows rsync embedding pattern: assets/sqlite_release_<os>_<arch>/
Zero external dependencies for release builds.
