Refactor TIMMY_TEST_PLAN.md and timmy_test.sh to support dual-mode payments (per-job and session-based). Add new tests for session endpoints and gracefully handle rate limiting in existing tests.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 418bf6f8-212b-4bb0-a7a5-8231a061da4e
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 290ed20c-1ddc-4b42-810d-8415dd3a9c08
Replit-Helium-Checkpoint-Created: true