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/checks/config-check.ts

@@ -0,0 +1,33 @@
+import { readConfig, configExists, resolveConfigPath } from "../config/store.js";
+import type { CheckResult } from "./index.js";
+
+export function configCheck(configPath?: string): CheckResult {
+  const filePath = resolveConfigPath(configPath);
+
+  if (!configExists(configPath)) {
+    return {
+      name: "Config file",
+      status: "fail",
+      message: `Config file not found at ${filePath}`,
+      canRepair: false,
+      repairHint: "Run `paperclip onboard` to create one",
+    };
+  }
+
+  try {
+    readConfig(configPath);
+    return {
+      name: "Config file",
+      status: "pass",
+      message: `Valid config at ${filePath}`,
+    };
+  } catch (err) {
+    return {
+      name: "Config file",
+      status: "fail",
+      message: `Invalid config: ${err instanceof Error ? err.message : String(err)}`,
+      canRepair: false,
+      repairHint: "Run `paperclip onboard` to recreate",
+    };
+  }
+}