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/postmark.js

@@ -9,6 +9,15 @@ if (!API_KEY) {
 }
 
 async function api(method, path, body, useAccountToken) {
+  if (args['dry-run']) {
+    const maskedHeaders = { 'Content-Type': 'application/json', 'Accept': 'application/json' }
+    if (useAccountToken) {
+      maskedHeaders['X-Postmark-Account-Token'] = '***'
+    } else {
+      maskedHeaders['X-Postmark-Server-Token'] = '***'
+    }
+    return { _dry_run: true, method, url: `${BASE_URL}${path}`, headers: maskedHeaders, body: body || undefined }
+  }
   const headers = {
     'Content-Type': 'application/json',
     'Accept': 'application/json',