### Breaking Changes
- `ctx.ui.custom()` factory signature changed from `(tui, theme, done)` to `(tui, theme, keybindings, done)` for keybinding access in custom components
- `LoadedExtension` type renamed to `Extension`
- `LoadExtensionsResult.setUIContext()` removed, replaced with `runtime: ExtensionRuntime`
- `ExtensionRunner` constructor now requires `runtime: ExtensionRuntime` as second parameter
- `ExtensionRunner.initialize()` signature changed from options object to positional params `(actions, contextActions, commandContextActions?, uiContext?)`
- `ExtensionRunner.getHasUI()` renamed to `hasUI()`
- OpenAI Codex model aliases removed (`gpt-5`, `gpt-5-mini`, `gpt-5-nano`, `codex-mini-latest`). Use canonical IDs: `gpt-5.1`, `gpt-5.1-codex-mini`, `gpt-5.2`, `gpt-5.2-codex`. ([#536](https://github.com/badlogic/pi-mono/pull/536) by [@ghoulr](https://github.com/ghoulr))
### Added
- `--no-extensions` flag to disable extension discovery while still allowing explicit `-e` paths ([#524](https://github.com/badlogic/pi-mono/pull/524) by [@cv](https://github.com/cv))
- SDK: `InteractiveMode`, `runPrintMode()`, `runRpcMode()` exported for building custom run modes. See `docs/sdk.md`.
- `PI_SKIP_VERSION_CHECK` environment variable to disable new version notifications at startup ([#549](https://github.com/badlogic/pi-mono/pull/549) by [@aos](https://github.com/aos))
- `thinkingBudgets` setting to customize token budgets per thinking level for token-based providers ([#529](https://github.com/badlogic/pi-mono/pull/529) by [@melihmucuk](https://github.com/melihmucuk))
- Extension UI dialogs (`ctx.ui.select()`, `ctx.ui.confirm()`, `ctx.ui.input()`) now support a `timeout` option with live countdown display ([#522](https://github.com/badlogic/pi-mono/pull/522) by [@nicobailon](https://github.com/nicobailon))
- Extensions can now provide custom editor components via `ctx.ui.setEditorComponent()`. See `examples/extensions/modal-editor.ts` and `docs/tui.md` Pattern 7.
- Extension factories can now be async, enabling dynamic imports and lazy-loaded dependencies ([#513](https://github.com/badlogic/pi-mono/pull/513) by [@austinm911](https://github.com/austinm911))
- `ctx.shutdown()` is now available in extension contexts for requesting a graceful shutdown. In interactive mode, shutdown is deferred until the agent becomes idle (after processing all queued steering and follow-up messages). In RPC mode, shutdown is deferred until after completing the current command response. In print mode, shutdown is a no-op as the process exits automatically when prompts complete. ([#542](https://github.com/badlogic/pi-mono/pull/542) by [@kaofelix](https://github.com/kaofelix))
### Fixed
- Default thinking level from settings now applies correctly when `enabledModels` is configured ([#540](https://github.com/badlogic/pi-mono/pull/540) by [@ferologics](https://github.com/ferologics))
- External edits to `settings.json` while pi is running are now preserved when pi saves settings ([#527](https://github.com/badlogic/pi-mono/pull/527) by [@ferologics](https://github.com/ferologics))
- Overflow-based compaction now skips if error came from a different model or was already handled by a previous compaction ([#535](https://github.com/badlogic/pi-mono/pull/535) by [@mitsuhiko](https://github.com/mitsuhiko))
- OpenAI Codex context window reduced from 400k to 272k tokens to match Codex CLI defaults and prevent 400 errors ([#536](https://github.com/badlogic/pi-mono/pull/536) by [@ghoulr](https://github.com/ghoulr))
- Context overflow detection now recognizes `context_length_exceeded` errors.
- Key presses no longer dropped when input is batched over SSH ([#538](https://github.com/badlogic/pi-mono/issues/538))
- Clipboard image support now works on Alpine Linux and other musl-based distros ([#533](https://github.com/badlogic/pi-mono/issues/533))