chore: remove run-easy, run-hard, run-medium, old examples/templates/docs/deploy

Remove generated task outputs and legacy scaffolding:
- run-easy/, run-hard/, run-medium/ (generated SWE tasks)
- examples/templates/ (old yaml task templates)
- prompts/ (old yaml prompt templates)
- plan/ (old design docs)
- docs/ (old documentation)
- deploy/ (old k8s/docker/prometheus configs)

Added to .gitignore to prevent re-commit.

Author: echobt

.gitignore

@@ -28,8 +28,12 @@ test-outputs/
 # Generated datasets and outputs
 outputs/
 generated-datasets/
+generated-swe/
 /swe-datasets/
 /test-run-hard/
+run-easy/
+run-medium/
+run-hard/
 *.jsonl
 
 test-verify/