feat(supervisor): port Python supervisor from padelnomics + workflows.toml

Port padelnomics' schedule-aware Python supervisor to materia:
- src/materia/supervisor.py — croniter scheduling, topological wave
  execution (parallel independent workflows), tag-based git pull + deploy,
  status CLI subcommand
- infra/supervisor/workflows.toml — workflow registry (psd daily, cot
  weekly, prices daily, ice daily, weather daily)
- infra/supervisor/materia-supervisor.service — updated ExecStart to Python
  supervisor, added SUPERVISOR_GIT_PULL=1

Adaptations from padelnomics:
- Uses extract_core.state.open_state_db (not padelnomics_extract.utils)
- uv run sqlmesh -p transform/sqlmesh_materia run
- uv run materia pipeline run export_serving
- web/deploy.sh path (materia's deploy.sh is under web/)
- Removed proxy_mode (not used in materia)

Also: add croniter dependency to src/materia, delete old supervisor.sh.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -16,6 +16,7 @@ dependencies = [
     "hcloud>=2.8.0",
     "prefect>=3.6.15",
     "msgspec>=0.19",
+    "croniter>=6.0.0",
 ]
 
 [project.scripts]