Add CLI package, config file support, and workspace setup

Add cli/ package with initial scaffolding. Add config-schema to shared
package for typed configuration. Add server config-file loader for
paperclip.config.ts support. Register cli in pnpm workspace. Add
.paperclip/ and .pnpm-store/ to gitignore. Minor Companies page fix.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cli/src/config/schema.ts

@@ -0,0 +1,14 @@
+export {
+  paperclipConfigSchema,
+  configMetaSchema,
+  llmConfigSchema,
+  databaseConfigSchema,
+  loggingConfigSchema,
+  serverConfigSchema,
+  type PaperclipConfig,
+  type LlmConfig,
+  type DatabaseConfig,
+  type LoggingConfig,
+  type ServerConfig,
+  type ConfigMeta,
+} from "@paperclip/shared";

cli/src/config/store.ts

@@ -0,0 +1,42 @@
+import fs from "node:fs";
+import path from "node:path";
+import { paperclipConfigSchema, type PaperclipConfig } from "./schema.js";
+
+const DEFAULT_CONFIG_PATH = ".paperclip/config.json";
+
+export function resolveConfigPath(overridePath?: string): string {
+  if (overridePath) return path.resolve(overridePath);
+  if (process.env.PAPERCLIP_CONFIG) return path.resolve(process.env.PAPERCLIP_CONFIG);
+  return path.resolve(process.cwd(), DEFAULT_CONFIG_PATH);
+}
+
+export function readConfig(configPath?: string): PaperclipConfig | null {
+  const filePath = resolveConfigPath(configPath);
+  if (!fs.existsSync(filePath)) return null;
+  const raw = JSON.parse(fs.readFileSync(filePath, "utf-8"));
+  return paperclipConfigSchema.parse(raw);
+}
+
+export function writeConfig(
+  config: PaperclipConfig,
+  configPath?: string,
+): void {
+  const filePath = resolveConfigPath(configPath);
+  const dir = path.dirname(filePath);
+  fs.mkdirSync(dir, { recursive: true });
+
+  // Backup existing config before overwriting
+  if (fs.existsSync(filePath)) {
+    const backupPath = filePath + ".backup";
+    fs.copyFileSync(filePath, backupPath);
+    fs.chmodSync(backupPath, 0o600);
+  }
+
+  fs.writeFileSync(filePath, JSON.stringify(config, null, 2) + "\n", {
+    mode: 0o600,
+  });
+}
+
+export function configExists(configPath?: string): boolean {
+  return fs.existsSync(resolveConfigPath(configPath));
+}