chore: Complete Temporal migration with updated CLI/SDK/docs

This commit includes all remaining Temporal migration changes:

## CLI Updates (cli/)
- Updated workflow execution commands for Temporal
- Enhanced error handling and exceptions
- Updated dependencies in uv.lock

## SDK Updates (sdk/)
- Client methods updated for Temporal workflows
- Updated models for new workflow execution
- Updated dependencies in uv.lock

## Documentation Updates (docs/)
- Architecture documentation for Temporal
- Workflow concept documentation
- Resource management documentation (new)
- Debugging guide (new)
- Updated tutorials and how-to guides
- Troubleshooting updates

## README Updates
- Main README with Temporal instructions
- Backend README
- CLI README
- SDK README

## Other
- Updated IMPLEMENTATION_STATUS.md
- Removed old vulnerable_app.tar.gz

These changes complete the Temporal migration and ensure the
CLI/SDK work correctly with the new backend.

cli/src/fuzzforge_cli/exceptions.py

@@ -430,8 +430,9 @@ def validate_run_id(run_id: str) -> str:
     if not run_id or len(run_id) < 8:
         raise ValidationError("run_id", run_id, "at least 8 characters")
 
-    if not run_id.replace('-', '').isalnum():
-        raise ValidationError("run_id", run_id, "alphanumeric characters and hyphens only")
+    # Allow alphanumeric characters, hyphens, and underscores
+    if not run_id.replace('-', '').replace('_', '').isalnum():
+        raise ValidationError("run_id", run_id, "alphanumeric characters, hyphens, and underscores only")
 
     return run_id