feat: package Pi extensions as Bun workspaces

extensions/subagents/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 JB
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

extensions/subagents/README.md

@@ -0,0 +1,9 @@
+# @_jb/pi-subagents
+
+Pi extension for background subagents using Pi, Claude Code, and Codex backends.
+
+```bash
+pi install npm:@_jb/pi-subagents
+```
+
+Do not enable it alongside another extension that registers the same subagent tools.

extensions/subagents/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "@_jb/pi-subagents",
+  "version": "0.1.0",
+  "description": "Pi extension for background subagents across Pi, Claude Code, and Codex backends.",
+  "type": "module",
+  "license": "MIT",
+  "engines": { "node": ">=22.19.0" },
+  "keywords": ["pi-package", "pi-extension", "subagents"],
+  "files": ["index.ts", "src", "docs", "README.md", "LICENSE", "!**/*.test.ts"],
+  "pi": { "extensions": ["./index.ts"] },
+  "dependencies": {
+    "@_jb/pi-shared": "workspace:^",
+    "@anthropic-ai/claude-agent-sdk": "catalog:",
+    "effect": "catalog:"
+  },
+  "peerDependencies": {
+    "@earendil-works/pi-ai": "catalog:pi-peer",
+    "@earendil-works/pi-coding-agent": "catalog:pi-peer",
+    "@earendil-works/pi-tui": "catalog:pi-peer",
+    "typebox": "catalog:pi-peer"
+  },
+  "publishConfig": {
+    "registry": "https://git.jb.codes/api/packages/jb/npm/"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://git@git.jb.codes:7722/jb/harness-tools.git",
+    "directory": "extensions/subagents"
+  }
+}

extensions/subagents/src/backends/pi.ts

@@ -37,8 +37,8 @@ import {
   createChildResources,
   shutdownAndDisposeChildSession,
   waitForChildOperation,
-} from "../../../shared/child-session.ts";
-import { createToolCallTimeoutGuard } from "../../../shared/tool-call-timeout.ts";
+} from "@_jb/pi-shared/child-session";
+import { createToolCallTimeoutGuard } from "@_jb/pi-shared/tool-call-timeout";
 
 // --- Model + effort resolution -----------------------------------------------