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

README.md

@@ -138,6 +138,10 @@ A three-component system:
 - **has_content function_call fix** (v3.11.6) — tool-call-only responses now correctly flagged as having content, preventing infinite loops on OpenAdapter/Z.AI/OpenRouter providers
 - **Vision/OCR preprocessing** (v3.11.6) — when provider rejects images, automatically calls a configurable vision fallback API (Kilo.ai) to describe images as text for text-only models; MD5-cached; retries on vision errors with preprocessed text
 - **Auth config-missing fix** (v3.11.6) — graceful handling when Codex config.toml is missing instead of showing raw os error
+- **Codex Desktop Updater** (v3.13.0) — built-in updater window with Check/Install/Rollback buttons, service management, and manual rebuild from source (`ilysenko/codex-desktop-linux`)
+- **Codex CLI 0.134.0 profile system** (v3.13.0) — profiles written to separate `~/.codex/<slug>.config.toml` files for compatibility with Codex CLI 0.134.0+
+- **Conservative compaction for large models** (v3.13.0) — `max_input_items: 200` for Antigravity's 1M-token models; prevents model from "forgetting" earlier file reads
+- **Antigravity E2E test suite** (v3.13.0) — `bash ~/.local/bin/test-antigravity.sh` validates token, REST endpoints, proxy adapter, model resolution
 - Zero dependencies — pure Python stdlib
 
 ### Command Code Adapter