fix: Modal API authentication working with SDK

- Discovered Modal requires SDK, not raw HTTP
- Token ID and Secret work with modal.Client.from_credentials()
- Raw HTTP calls don't work (need SDK)
- Updated documentation with correct usage
- Modal SDK authentication verified and working

Next: Integrate Modal SDK for scraping assistance when direct methods fail

agents/sales-lead/monitor.log

@@ -2357,3 +2357,35 @@
 [2026-04-10T20:00:01Z] ROI Calc submissions response: 7791 bytes
 [2026-04-10T20:00:01Z] Processing calc submissions...
 [2026-04-10T20:00:01Z] Check complete. Next run at 2026-04-10T17:00:EDT
+[2026-04-10T20:53:42Z] Starting lead monitor check
+[2026-04-10T20:53:43Z] ROI Calc submissions response: 7791 bytes
+[2026-04-10T20:53:43Z] Processing calc submissions...
+[2026-04-10T20:53:43Z] Check complete. Next run at 2026-04-10T17:53:EDT
+[2026-04-10T21:00:00Z] Starting lead monitor check
+[2026-04-10T21:00:00Z] ROI Calc submissions response: 7791 bytes
+[2026-04-10T21:00:00Z] Processing calc submissions...
+[2026-04-10T21:00:00Z] Check complete. Next run at 2026-04-10T18:00:EDT
+[2026-04-10T21:25:09Z] Starting lead monitor check
+[2026-04-10T21:25:10Z] ROI Calc submissions response: 7791 bytes
+[2026-04-10T21:25:10Z] Processing calc submissions...
+[2026-04-10T21:25:10Z] Check complete. Next run at 2026-04-10T18:25:EDT
+[2026-04-10T22:00:00Z] Starting lead monitor check
+[2026-04-10T22:00:01Z] ROI Calc submissions response: 7791 bytes
+[2026-04-10T22:00:01Z] Processing calc submissions...
+[2026-04-10T22:00:01Z] Check complete. Next run at 2026-04-10T19:00:EDT
+[2026-04-10T23:00:00Z] Starting lead monitor check
+[2026-04-10T23:00:01Z] ROI Calc submissions response: 7791 bytes
+[2026-04-10T23:00:01Z] Processing calc submissions...
+[2026-04-10T23:00:01Z] Check complete. Next run at 2026-04-10T20:00:EDT
+[2026-04-11T00:00:01Z] Starting lead monitor check
+[2026-04-11T00:00:02Z] ROI Calc submissions response: 7791 bytes
+[2026-04-11T00:00:02Z] Processing calc submissions...
+[2026-04-11T00:00:02Z] Check complete. Next run at 2026-04-10T21:00:EDT
+[2026-04-11T00:01:01Z] Starting lead monitor check
+[2026-04-11T00:01:02Z] ROI Calc submissions response: 7791 bytes
+[2026-04-11T00:01:02Z] Processing calc submissions...
+[2026-04-11T00:01:02Z] Check complete. Next run at 2026-04-10T21:01:EDT
+[2026-04-11T00:55:27Z] Starting lead monitor check
+[2026-04-11T00:55:28Z] ROI Calc submissions response: 7791 bytes
+[2026-04-11T00:55:28Z] Processing calc submissions...
+[2026-04-11T00:55:28Z] Check complete. Next run at 2026-04-10T21:55:EDT