setup: workspace, dev deps, and project-local extension install

- Add pnpm-workspace.yaml for monorepo
- Add @mariozechner/pi-coding-agent as root devDependency (TS types)
- Create .pi/settings.json with local package reference
- Extension auto-loads and hot-reloads via /reload

.pi/settings.json

@@ -0,0 +1,5 @@
+{
+  "packages": [
+    "../packages/pi-turn-limit"
+  ]
+}

autoresearch.jsonl

@@ -0,0 +1 @@
+{"type":"config","name":"Turn-limit extension naming","metricName":"extension_name","metricUnit":"","bestDirection":"lower"}

package.json

@@ -7,5 +7,8 @@
   "license": "MIT",
   "engines": {
     "node": ">=24"
+  },
+  "devDependencies": {
+    "@mariozechner/pi-coding-agent": "*"
   }
 }

packages/pi-turn-limit/package.json

@@ -4,11 +4,11 @@
   "description": "Pi coding agent extension to limit number of turns taken by a model",
   "type": "module",
   "exports": {
-    ".": "./src/index.ts"
+    ".": "./src/turn-limit.ts"
   },
   "keywords": ["pi-package"],
   "pi": {
-    "extensions": ["src/index.ts"]
+    "extensions": ["src/turn-limit.ts"]
   },
   "peerDependencies": {
     "@mariozechner/pi-coding-agent": "*"

packages/pi-turn-limit/src/turn-limit.ts

@@ -0,0 +1,56 @@
+import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
+
+// ============================================================================
+// Configuration
+// ============================================================================
+
+const DEFAULT_MAX_TURNS = 25;
+
+function getMaxTurns(): number {
+  const env = process.env.PI_MAX_TURNS;
+  if (!env) return DEFAULT_MAX_TURNS;
+  const parsed = parseInt(env, 10);
+  return Number.isFinite(parsed) && parsed > 0 ? parsed : DEFAULT_MAX_TURNS;
+}
+
+// ============================================================================
+// Pure detection logic (testable)
+// ============================================================================
+
+export function checkTurnLimit(
+  turnIndex: number,
+  maxTurns: number,
+): { exceeded: boolean; turnIndex: number; maxTurns: number } {
+  return {
+    exceeded: turnIndex > maxTurns,
+    turnIndex,
+    maxTurns,
+  };
+}
+
+// ============================================================================
+// Extension handler
+// ============================================================================
+
+export default function (pi: ExtensionAPI) {
+  let turnCount = 0;
+  const maxTurns = getMaxTurns();
+
+  pi.on("agent_start", async (_event, ctx) => {
+    // Reset counter for each new user prompt
+    turnCount = 0;
+  });
+
+  pi.on("turn_start", async (event, ctx) => {
+    turnCount++;
+
+    const { exceeded } = checkTurnLimit(event.turnIndex, maxTurns);
+    if (exceeded && ctx.hasUI) {
+      ctx.ui.notify(
+        `Turn limit exceeded: ${maxTurns} turns reached. Agent aborted.`,
+        "error",
+      );
+      ctx.abort();
+    }
+  });
+}