PR Template - Sprint 19 Task 09

Task

Implement immutable configuration version history.

Summary

• Added append-only config history with chained record hashes and duplicate-version rejection.

Scope

• src/pkg/orchestrator/control_plane_integrity.py
• tests/unit/test_control_plane_integrity.py

Validation

• PYTHONPATH=src .venv/bin/pytest -q tests/unit/test_control_plane_integrity.py -k immutable_history