fix: harden CLI tools against credential leakage

Move Supermetrics API key from query string to x-api-key header.
Mask ZoomInfo JWT by default in auth command (use --show-token to reveal).

Cherry-picked from #201.

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

tools/clis/supermetrics.js

@@ -9,17 +9,18 @@ if (!API_KEY) {
 }
 
 async function api(method, path, body) {
-  const separator = path.includes('?') ? '&' : '?'
-  const url = `${BASE_URL}${path}${separator}api_key=${API_KEY}`
+  const url = `${BASE_URL}${path}`
+  const headers = {
+    'Content-Type': 'application/json',
+    'Accept': 'application/json',
+    'x-api-key': API_KEY,
+  }
   if (args['dry-run']) {
-    return { _dry_run: true, method, url: url.replace(API_KEY, '***'), headers: { 'Content-Type': 'application/json', 'Accept': 'application/json' }, body: body || undefined }
+    return { _dry_run: true, method, url, headers: { ...headers, 'x-api-key': '***' }, body: body || undefined }
   }
   const res = await fetch(url, {
     method,
-    headers: {
-      'Content-Type': 'application/json',
-      'Accept': 'application/json',
-    },
+    headers,
     body: body ? JSON.stringify(body) : undefined,
   })
   const text = await res.text()

tools/clis/zoominfo.js

@@ -92,7 +92,14 @@ async function main() {
         break
       }
       const token = await authenticate()
+      if (args['show-token']) {
         result = { jwt: token }
+      } else {
+        const masked = token.length > 12
+          ? token.slice(0, 6) + '…' + token.slice(-6)
+          : '***'
+        result = { jwt: masked, hint: 'Use --show-token to reveal full JWT' }
+      }
       break
     }
 
@@ -188,7 +195,7 @@ async function main() {
       result = {
         error: 'Unknown command',
         usage: {
-          auth: 'auth — authenticate and get JWT token',
+          auth: 'auth [--show-token] — authenticate and get JWT token (masked by default)',
           contacts: {
             search: 'contacts search [--job-title <t>] [--company <c>] [--location <l>] [--seniority <s>] [--department <d>] [--page <n>]',
             enrich: 'contacts enrich --email <email> | --person-id <id>',