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/web-ui/src/tools/renderers/DefaultRenderer.ts

@@ -1,103 +0,0 @@
-import type { ToolResultMessage } from "@mariozechner/pi-ai";
-import { html } from "lit";
-import { Code } from "lucide";
-import { i18n } from "../../utils/i18n.js";
-import { renderHeader } from "../renderer-registry.js";
-import type { ToolRenderer, ToolRenderResult } from "../types.js";
-
-export class DefaultRenderer implements ToolRenderer {
-	render(params: any | undefined, result: ToolResultMessage | undefined, isStreaming?: boolean): ToolRenderResult {
-		const state = result ? (result.isError ? "error" : "complete") : isStreaming ? "inprogress" : "complete";
-
-		// Format params as JSON
-		let paramsJson = "";
-		if (params) {
-			try {
-				paramsJson = JSON.stringify(JSON.parse(params), null, 2);
-			} catch {
-				try {
-					paramsJson = JSON.stringify(params, null, 2);
-				} catch {
-					paramsJson = String(params);
-				}
-			}
-		}
-
-		// With result: show header + params + result
-		if (result) {
-			let outputJson =
-				result.content
-					?.filter((c) => c.type === "text")
-					.map((c: any) => c.text)
-					.join("\n") || i18n("(no output)");
-			let outputLanguage = "text";
-
-			// Try to parse and pretty-print if it's valid JSON
-			try {
-				const parsed = JSON.parse(outputJson);
-				outputJson = JSON.stringify(parsed, null, 2);
-				outputLanguage = "json";
-			} catch {
-				// Not valid JSON, leave as-is and use text highlighting
-			}
-
-			return {
-				content: html`
-					<div class="space-y-3">
-						${renderHeader(state, Code, "Tool Call")}
-						${
-							paramsJson
-								? html`<div>
-							<div class="text-xs font-medium mb-1 text-muted-foreground">${i18n("Input")}</div>
-							<code-block .code=${paramsJson} language="json"></code-block>
-						</div>`
-								: ""
-						}
-						<div>
-							<div class="text-xs font-medium mb-1 text-muted-foreground">${i18n("Output")}</div>
-							<code-block .code=${outputJson} language="${outputLanguage}"></code-block>
-						</div>
-					</div>
-				`,
-				isCustom: false,
-			};
-		}
-
-		// Just params (streaming or waiting for result)
-		if (params) {
-			if (isStreaming && (!paramsJson || paramsJson === "{}" || paramsJson === "null")) {
-				return {
-					content: html`
-						<div>
-							${renderHeader(state, Code, "Preparing tool parameters...")}
-						</div>
-					`,
-					isCustom: false,
-				};
-			}
-
-			return {
-				content: html`
-					<div class="space-y-3">
-						${renderHeader(state, Code, "Tool Call")}
-						<div>
-							<div class="text-xs font-medium mb-1 text-muted-foreground">${i18n("Input")}</div>
-							<code-block .code=${paramsJson} language="json"></code-block>
-						</div>
-					</div>
-				`,
-				isCustom: false,
-			};
-		}
-
-		// No params or result yet
-		return {
-			content: html`
-				<div>
-					${renderHeader(state, Code, "Preparing tool...")}
-				</div>
-			`,
-			isCustom: false,
-		};
-	}
-}