chore: drop non-code junk (pi-mono-reference, runtime state, root duplicates)

Remove files that should never have been tracked:

- pi-mono-reference/: 688-file copy of an upstream monorepo, zero imports,
  used only as offline human reference
- build/electron-builder.runtime.json: environment-specific build artifact
  with hardcoded local paths
- state/cancel-signal-state.json: runtime state written by the app
- prompt.txt, logo.svg (root): exact duplicates of the canonical copies
  under .planning/archive/ and assets/

Add state/ to .gitignore so future runtime state stays out.

pi-mono-reference/packages/tui/src/index.ts

@@ -1,104 +0,0 @@
-// Core TUI interfaces and classes
-
-// Autocomplete support
-export {
-	type AutocompleteItem,
-	type AutocompleteProvider,
-	type AutocompleteSuggestions,
-	CombinedAutocompleteProvider,
-	type SlashCommand,
-} from "./autocomplete.js";
-// Components
-export { Box } from "./components/box.js";
-export { CancellableLoader } from "./components/cancellable-loader.js";
-export { Editor, type EditorOptions, type EditorTheme } from "./components/editor.js";
-export { Image, type ImageOptions, type ImageTheme } from "./components/image.js";
-export { Input } from "./components/input.js";
-export { Loader } from "./components/loader.js";
-export { type DefaultTextStyle, Markdown, type MarkdownTheme } from "./components/markdown.js";
-export {
-	type SelectItem,
-	SelectList,
-	type SelectListLayoutOptions,
-	type SelectListTheme,
-	type SelectListTruncatePrimaryContext,
-} from "./components/select-list.js";
-export { type SettingItem, SettingsList, type SettingsListTheme } from "./components/settings-list.js";
-export { Spacer } from "./components/spacer.js";
-export { Text } from "./components/text.js";
-export { TruncatedText } from "./components/truncated-text.js";
-// Editor component interface (for custom editors)
-export type { EditorComponent } from "./editor-component.js";
-// Fuzzy matching
-export { type FuzzyMatch, fuzzyFilter, fuzzyMatch } from "./fuzzy.js";
-// Keybindings
-export {
-	getKeybindings,
-	type Keybinding,
-	type KeybindingConflict,
-	type KeybindingDefinition,
-	type KeybindingDefinitions,
-	type Keybindings,
-	type KeybindingsConfig,
-	KeybindingsManager,
-	setKeybindings,
-	TUI_KEYBINDINGS,
-} from "./keybindings.js";
-// Keyboard input handling
-export {
-	decodeKittyPrintable,
-	isKeyRelease,
-	isKeyRepeat,
-	isKittyProtocolActive,
-	Key,
-	type KeyEventType,
-	type KeyId,
-	matchesKey,
-	parseKey,
-	setKittyProtocolActive,
-} from "./keys.js";
-// Input buffering for batch splitting
-export { StdinBuffer, type StdinBufferEventMap, type StdinBufferOptions } from "./stdin-buffer.js";
-// Terminal interface and implementations
-export { ProcessTerminal, type Terminal } from "./terminal.js";
-// Terminal image support
-export {
-	allocateImageId,
-	type CellDimensions,
-	calculateImageRows,
-	deleteAllKittyImages,
-	deleteKittyImage,
-	detectCapabilities,
-	encodeITerm2,
-	encodeKitty,
-	getCapabilities,
-	getCellDimensions,
-	getGifDimensions,
-	getImageDimensions,
-	getJpegDimensions,
-	getPngDimensions,
-	getWebpDimensions,
-	type ImageDimensions,
-	type ImageProtocol,
-	type ImageRenderOptions,
-	imageFallback,
-	renderImage,
-	resetCapabilitiesCache,
-	setCellDimensions,
-	type TerminalCapabilities,
-} from "./terminal-image.js";
-export {
-	type Component,
-	Container,
-	CURSOR_MARKER,
-	type Focusable,
-	isFocusable,
-	type OverlayAnchor,
-	type OverlayHandle,
-	type OverlayMargin,
-	type OverlayOptions,
-	type SizeValue,
-	TUI,
-} from "./tui.js";
-// Utilities
-export { truncateToWidth, visibleWidth, wrapTextWithAnsi } from "./utils.js";