v3.13.0: Desktop Updater, profile system fix, Antigravity E2E, conservative compaction
- Codex Desktop Updater: check/install/rollback/service management + manual rebuild
- Fix Codex CLI 0.134.0 profiles: separate <slug>.config.toml files
- Fix Antigravity: prod endpoint first, model resolution, OAUTH_PROVIDER
- Fix compaction: max_input_items 60->200 for 1M-token models
- Antigravity E2E test suite: test-antigravity.sh
- Windows GUI: UpdateDesktopWindow + profile slug fix
- Updated CHANGELOG.md and README.md
