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/coding-agent/src/cli/list-models.ts

@@ -1,110 +0,0 @@
-/**
- * List available models with optional fuzzy search
- */
-
-import type { Api, Model } from "@mariozechner/pi-ai";
-import { fuzzyFilter } from "@mariozechner/pi-tui";
-import chalk from "chalk";
-import type { ModelRegistry } from "../core/model-registry.js";
-
-/**
- * Format a number as human-readable (e.g., 200000 -> "200K", 1000000 -> "1M")
- */
-function formatTokenCount(count: number): string {
-	if (count >= 1_000_000) {
-		const millions = count / 1_000_000;
-		return millions % 1 === 0 ? `${millions}M` : `${millions.toFixed(1)}M`;
-	}
-	if (count >= 1_000) {
-		const thousands = count / 1_000;
-		return thousands % 1 === 0 ? `${thousands}K` : `${thousands.toFixed(1)}K`;
-	}
-	return count.toString();
-}
-
-/**
- * List available models, optionally filtered by search pattern
- */
-export async function listModels(modelRegistry: ModelRegistry, searchPattern?: string): Promise<void> {
-	const loadError = modelRegistry.getError();
-	if (loadError) {
-		console.error(chalk.yellow(`Warning: errors loading models.json:\n${loadError}`));
-	}
-
-	const models = modelRegistry.getAvailable();
-
-	if (models.length === 0) {
-		console.log("No models available. Set API keys in environment variables.");
-		return;
-	}
-
-	// Apply fuzzy filter if search pattern provided
-	let filteredModels: Model<Api>[] = models;
-	if (searchPattern) {
-		filteredModels = fuzzyFilter(models, searchPattern, (m) => `${m.provider} ${m.id}`);
-	}
-
-	if (filteredModels.length === 0) {
-		console.log(`No models matching "${searchPattern}"`);
-		return;
-	}
-
-	// Sort by provider, then by model id
-	filteredModels.sort((a, b) => {
-		const providerCmp = a.provider.localeCompare(b.provider);
-		if (providerCmp !== 0) return providerCmp;
-		return a.id.localeCompare(b.id);
-	});
-
-	// Calculate column widths
-	const rows = filteredModels.map((m) => ({
-		provider: m.provider,
-		model: m.id,
-		context: formatTokenCount(m.contextWindow),
-		maxOut: formatTokenCount(m.maxTokens),
-		thinking: m.reasoning ? "yes" : "no",
-		images: m.input.includes("image") ? "yes" : "no",
-	}));
-
-	const headers = {
-		provider: "provider",
-		model: "model",
-		context: "context",
-		maxOut: "max-out",
-		thinking: "thinking",
-		images: "images",
-	};
-
-	const widths = {
-		provider: Math.max(headers.provider.length, ...rows.map((r) => r.provider.length)),
-		model: Math.max(headers.model.length, ...rows.map((r) => r.model.length)),
-		context: Math.max(headers.context.length, ...rows.map((r) => r.context.length)),
-		maxOut: Math.max(headers.maxOut.length, ...rows.map((r) => r.maxOut.length)),
-		thinking: Math.max(headers.thinking.length, ...rows.map((r) => r.thinking.length)),
-		images: Math.max(headers.images.length, ...rows.map((r) => r.images.length)),
-	};
-
-	// Print header
-	const headerLine = [
-		headers.provider.padEnd(widths.provider),
-		headers.model.padEnd(widths.model),
-		headers.context.padEnd(widths.context),
-		headers.maxOut.padEnd(widths.maxOut),
-		headers.thinking.padEnd(widths.thinking),
-		headers.images.padEnd(widths.images),
-	].join("  ");
-	console.log(headerLine);
-
-	// Print rows
-	for (const row of rows) {
-		const line = [
-			row.provider.padEnd(widths.provider),
-			row.model.padEnd(widths.model),
-			row.context.padEnd(widths.context),
-			row.maxOut.padEnd(widths.maxOut),
-			row.thinking.padEnd(widths.thinking),
-			row.images.padEnd(widths.images),
-		].join("  ");
-		console.log(line);
-	}
-}