v3.10.5 — Update CHANGELOG + README: compaction, OAuth secrets, model mapping

README.md

@@ -546,6 +546,16 @@ Codex Launcher includes special handling for Gemini 3 / Antigravity OAuth:
 - **User instruction enforcement**: The latest user message is guaranteed to be the
   final content turn sent to Gemini, even after compaction.
 - **Smart compaction**: Old tool outputs capped at 3000 chars, recent 6 at 20000 chars.
+- **Context compaction**: Aggressive auto-trimming when approaching 60% of model context
+  limit (1M tokens Gemini, 200K Claude, 128K GPT-OSS). Prevents token limit errors.
+- **Model ID mapping**: Display names (e.g. `Gemini 3.5 Flash (High)`) mapped to REST API
+  slugs (e.g. `gemini-3-flash`). See `docs/ANTIGRAVITY.md` for details.
+
+### OAuth Secrets
+
+Google OAuth credentials are stored locally in `~/.config/codex-launcher/oauth-secrets.json`
+and never committed to the repository. Use the **OAuth Secrets** button in the launcher
+header to edit or import `client_secret_*.json` files from Google Cloud Console.
 
 ---