Update docs for ctx.ui.editor() and handoff example

- Added ctx.ui.editor() to hooks.md and custom-tools.md
- Added ctx.ui.editor() to CHANGELOG.md
- Added handoff.ts to examples/hooks/README.md

packages/coding-agent/examples/README.md

@@ -1,6 +1,6 @@
 # Examples
 
-Example code for pi-coding-agent.
+Example code for pi-coding-agent SDK, hooks, and custom tools.
 
 ## Directories
 
@@ -13,14 +13,6 @@ Example hooks for intercepting tool calls, adding safety gates, and integrating
 ### [custom-tools/](custom-tools/)
 Example custom tools that extend the agent's capabilities.
 
-## Running Examples
-
-```bash
-cd packages/coding-agent
-npx tsx examples/sdk/01-minimal.ts
-npx tsx examples/hooks/permission-gate.ts
-```
-
 ## Documentation
 
 - [SDK Reference](sdk/README.md)

packages/coding-agent/examples/hooks/README.md

@@ -27,6 +27,7 @@ cp permission-gate.ts ~/.pi/agent/hooks/
 | `qna.ts` | Extracts questions from last response into editor via `ctx.ui.setEditorText()` |
 | `snake.ts` | Snake game with custom UI, keyboard handling, and session persistence |
 | `status-line.ts` | Shows turn progress in footer via `ctx.ui.setStatus()` with themed colors |
+| `handoff.ts` | Transfer context to a new focused session via `/handoff <goal>` |
 
 ## Writing Hooks