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>

mcp/delegate.ts

@@ -1,6 +1,7 @@
 import { type } from "arktype";
 import { Effort } from "../external.ts";
 import type { Mode } from "../modes.ts";
+import { markActivity } from "../utils/activity.ts";
 import { log } from "../utils/cli.ts";
 import { resolveSubagentInstructions } from "../utils/instructions.ts";
 import type { ToolContext } from "./server.ts";
@@ -71,6 +72,12 @@ export function DelegateTool(ctx: ToolContext) {
         `» delegating to ${selectedMode.name} mode (effort=${effort})${params.instructions ? " with orchestrator instructions" : ""}`
       );
 
+      // keep the process-level activity timeout alive while the subagent runs.
+      // agent CLIs can have long silent thinking phases (>60s) with no stdout,
+      // which would trigger the activity timeout. the overall run timeout (default 1h)
+      // is the real safety net for stalled agents.
+      const keepAliveInterval = setInterval(markActivity, 30_000);
+
       try {
         // build subagent payload with effort override
         const subagentPayload = { ...ctx.payload, effort };
@@ -112,6 +119,7 @@ export function DelegateTool(ctx: ToolContext) {
           error: errorMessage,
         };
       } finally {
+        clearInterval(keepAliveInterval);
         // always release the lock so the orchestrator can delegate again
         ctx.toolState.delegationActive = false;
       }