chore: remove generated python cache artifacts

.gitignore

@@ -1,2 +1,4 @@
 .worktrees/
 .tmp/
+__pycache__/
+*.pyc

.ralph/ralph-history.md

@@ -99,3 +99,16 @@
   - comment url: `http://154.39.79.147:3000/FunMD/document-collab/issues/48#issuecomment-246`
 - Blockers:
   - None for the Gitea single-platform acceptance target.
+
+## Iteration 6
+
+- Goal: remove generated Python cache artifacts accidentally staged into git
+- Changed files:
+  - `.gitignore`
+  - removed tracked `__pycache__/*.pyc` artifacts under `engine/` and `tests/`
+- Verification:
+  - `python -m pytest tests/unit tests/integration tests/acceptance -q`
+  - `git diff --check`
+  - Result: `19 passed`
+- Blockers:
+  - Two sandbox-created `pytest-cache-files-*` directories remain unreadable to git status in this environment, but they are not tracked and do not affect the runtime or tests.