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/claude.ts

@@ -142,6 +142,7 @@ export const claude = agent({
       activityTimeout: 0, // disabled: process-level timeout in main.ts handles this (subprocess timeout would kill orchestrator during delegation)
       onStdout: async (chunk) => {
         finalOutput += chunk;
+        markActivity(); // reset activity timeout on any CLI output
 
         // buffer incomplete lines across chunks (NDJSON format)
         stdoutBuffer += chunk;

agents/codex.ts

@@ -232,6 +232,7 @@ export const codex = agent({
       activityTimeout: 0, // disabled: process-level timeout in main.ts handles this (subprocess timeout would kill orchestrator during delegation)
       onStdout: async (chunk) => {
         finalOutput += chunk;
+        markActivity(); // reset activity timeout on any CLI output
 
         // buffer incomplete lines across chunks (NDJSON format)
         stdoutBuffer += chunk;

agents/cursor.ts

@@ -274,6 +274,7 @@ export const cursor = agent({
 
         let stdout = "";
         let stderr = "";
+        let stdoutBuffer = "";
 
         child.on("spawn", () => {
           log.debug("Cursor CLI process spawned");
@@ -282,25 +283,36 @@ export const cursor = agent({
         child.stdout?.on("data", async (data) => {
           const text = data.toString();
           stdout += text;
+          markActivity(); // reset activity timeout on any CLI output
 
-          try {
-            const event = JSON.parse(text) as CursorEvent;
-            markActivity(); // reset activity timeout on every event
-            log.debug(JSON.stringify(event, null, 2));
+          // buffer incomplete lines across chunks (NDJSON format)
+          stdoutBuffer += text;
+          const lines = stdoutBuffer.split("\n");
 
-            // skip empty thinking deltas
-            if (event.type === "thinking" && event.subtype === "delta" && !event.text) {
-              return;
+          // keep the last element (may be incomplete) in the buffer
+          stdoutBuffer = lines.pop() || "";
+
+          for (const line of lines) {
+            const trimmed = line.trim();
+            if (!trimmed) continue;
+
+            try {
+              const event = JSON.parse(trimmed) as CursorEvent;
+              log.debug(JSON.stringify(event, null, 2));
+
+              // skip empty thinking deltas
+              if (event.type === "thinking" && event.subtype === "delta" && !event.text) {
+                continue;
+              }
+
+              // route to appropriate handler
+              const handler = messageHandlers[event.type as keyof typeof messageHandlers];
+              if (handler) {
+                await handler(event as never);
+              }
+            } catch {
+              // ignore parse errors - might be formatted tool call logs from cursor cli
             }
-
-            // route to appropriate handler
-            const handler = messageHandlers[event.type as keyof typeof messageHandlers];
-            if (handler) {
-              await handler(event as never);
-            }
-          } catch {
-            // ignore parse errors - might be formatted tool call logs from cursor cli
-            // our handlers log tool calls instead, so we don't need to display these
           }
         });
 

agents/gemini.ts

@@ -239,6 +239,7 @@ export const gemini = agent({
           onStdout: async (chunk) => {
             const text = chunk.toString();
             finalOutput += text;
+            markActivity(); // reset activity timeout on any CLI output
 
             // buffer incomplete lines across chunks (NDJSON format)
             stdoutBuffer += text;

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;