fix delegate timeout (#284)

* pin all CLI installations to explicit versions and use pro models by default

- codex: pin @openai/codex to 0.101.0 (was "latest")
- opencode: pin opencode-ai to 1.1.56 (was "latest")
- gemini: pin gemini-cli to v0.28.2 via new tag param on installFromGithub
- cursor: pin to 2026.01.28-fd13201 via direct tarball download (replaces curl install script)
- add installFromDirectTarball to install.ts for versioned tarball URLs
- gemini auto effort now uses pro-preview instead of flash-preview
- test runner model overrides updated to use pro-preview consistently

Co-authored-by: Cursor <cursoragent@cursor.com>

* increase activity timeout

* fix delegation timeout

* fix delegate timeouts

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

agents/opencode.ts

@@ -123,6 +123,7 @@ export const opencode = agent({
         onStdout: async (chunk) => {
           const text = chunk.toString();
           output += text;
+          markActivity(); // reset activity timeout on any CLI output
 
           // buffer incomplete lines across chunks (NDJSON format)
           stdoutBuffer += text;