Custom tools with session lifecycle, examples for hooks and tools

- Custom tools: TypeScript modules that extend pi with new tools
  - Custom TUI rendering via renderCall/renderResult
  - User interaction via pi.ui (select, confirm, input, notify)
  - Session lifecycle via onSession callback for state reconstruction
  - Examples: todo.ts, question.ts, hello.ts

- Hook examples: permission-gate, git-checkpoint, protected-paths

- Session lifecycle centralized in AgentSession
  - Works across all modes (interactive, print, RPC)
  - Unified session event for hooks (replaces session_start/session_switch)

- Box component added to pi-tui

- Examples bundled in npm and binary releases

Fixes #190

packages/coding-agent/package.json

@@ -25,6 +25,7 @@
 	"files": [
 		"dist",
 		"docs",
+		"examples",
 		"CHANGELOG.md"
 	],
 	"scripts": {
@@ -32,9 +33,9 @@
 		"build": "tsgo -p tsconfig.build.json && chmod +x dist/cli.js && npm run copy-assets",
 		"build:binary": "npm run build && bun build --compile ./dist/cli.js --outfile dist/pi && npm run copy-binary-assets",
 		"copy-assets": "mkdir -p dist/modes/interactive/theme && cp src/modes/interactive/theme/*.json dist/modes/interactive/theme/",
-		"copy-binary-assets": "cp package.json dist/ && cp README.md dist/ && cp CHANGELOG.md dist/ && mkdir -p dist/theme && cp src/modes/interactive/theme/*.json dist/theme/ && cp -r docs dist/",
+		"copy-binary-assets": "cp package.json dist/ && cp README.md dist/ && cp CHANGELOG.md dist/ && mkdir -p dist/theme && cp src/modes/interactive/theme/*.json dist/theme/ && cp -r docs dist/ && cp -r examples dist/",
 		"dev": "tsgo -p tsconfig.build.json --watch --preserveWatchOutput",
-		"check": "tsgo --noEmit",
+		"check": "tsgo --noEmit && tsc -p tsconfig.examples.json",
 		"test": "vitest --run",
 		"prepublishOnly": "npm run clean && npm run build"
 	},