Monitor CAP stcUSD state

[spalen0]

Summary

• add an hourly batched monitor for stcUSD accounting
• send transition-deduplicated CRITICAL alerts for insufficient cUSD backing or a falling stcUSD asset-per-share value
• document why lockDuration does not need a separate state monitor: it has no setter and changes require an upgrade controlled by the monitored CAP timelock
• update CAP monitoring metadata, scheduling, ABI, and tests

Verification

• uv run pytest -q tests/test_cap_status.py tests/test_monitoring_config.py
• uv run ruff check protocols/cap/status.py tests/test_cap_status.py
• uv run ruff format --check protocols/cap/status.py tests/test_cap_status.py
• uv run mypy --explicit-package-bases --follow-imports=skip protocols/cap/status.py tests/test_cap_status.py
• live Mainnet batch read
• uvx prek run