feat: add --dry-run flag to all 47 CLI tools

When --dry-run is passed, each CLI prints the HTTP request it would
make (method, URL, headers, body) without actually calling fetch().
Auth credentials are masked as "***" in the output.

Useful for verifying request shape and API endpoints without needing
real API keys or making actual API calls.

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

tools/clis/intercom.js

@@ -9,6 +9,9 @@ if (!API_KEY) {
 }
 
 async function api(method, path, body) {
+  if (args['dry-run']) {
+    return { _dry_run: true, method, url: `${BASE_URL}${path}`, headers: { Authorization: '***', 'Content-Type': 'application/json', Accept: 'application/json', 'Intercom-Version': '2.11' }, body: body || undefined }
+  }
   const res = await fetch(`${BASE_URL}${path}`, {
     method,
     headers: {