Hooks can render custom status (#385)

* Add ctx.ui.setStatus(key, text) API for hooks to display status in footer

- Add setStatus to HookUIContext interface
- Implement in interactive mode (FooterComponent)
- Implement in RPC mode (fire-and-forget)
- Add no-op implementations for headless contexts
- Multiple statuses displayed on single line, sorted by key
- Supports ANSI styling (hooks handle their own colors)

* Remove setStatus from changelog for now

* Fix hook status API to follow TUI rules

- Sanitize status text: replace newlines, tabs, carriage returns with spaces
- Truncate combined status line to terminal width using truncateToWidth
- Update JSDoc to document sanitization and truncation behavior
- Remove unused createHookUIContext method
- Add missing setStatus to test mock

* Add setStatus to changelog

* Use dim ellipsis for hook status truncation for consistency with footer style

---------

Co-authored-by: Mario Zechner <badlogicgames@gmail.com>

packages/coding-agent/CHANGELOG.md

@@ -35,6 +35,7 @@ The hooks API has been restructured with more granular events and better session
 - New `pi.registerCommand(name, options)` for custom slash commands
 - New `pi.registerMessageRenderer(customType, renderer)` for custom TUI rendering
 - New `ctx.ui.custom(component)` for full TUI component rendering with keyboard focus
+- New `ctx.ui.setStatus(key, text)` for persistent status text in footer (multiple hooks can set their own)
 - `ctx.exec()` moved to `pi.exec()`
 - `ctx.sessionFile` → `ctx.sessionManager.getSessionFile()`
 - New `ctx.modelRegistry` and `ctx.model` for API key resolution
@@ -189,6 +190,7 @@ Total color count increased from 46 to 50. See [docs/theme.md](docs/theme.md) fo
 
 ### Added
 
+- `ctx.ui.setStatus(key, text)` for hooks to display persistent status text in the footer ([#385](https://github.com/badlogic/pi-mono/pull/385) by [@prateekmedia](https://github.com/prateekmedia))
 - `/share` command to upload session as a secret GitHub gist and get a shareable URL via shittycodingagent.ai ([#380](https://github.com/badlogic/pi-mono/issues/380))
 - HTML export now includes a tree visualization sidebar for navigating session branches ([#375](https://github.com/badlogic/pi-mono/issues/375))
 - HTML export supports keyboard shortcuts: Ctrl+T to toggle thinking blocks, Ctrl+O to toggle tool outputs