Add hourly wage and employment income consistency diagnostics

[MaxGhenis]

Summary

Fixes #848.

• Add a reusable hourly wage vs annual employment income consistency diagnostic for H5 sanity checks.
• Quantify weighted mismatch share, mean absolute relative gap, p90 gap, and the share whose hourly facts imply annual wages above reported employment income.
• Report both all comparable hourly workers and an overtime-hours subset.
• Add unit coverage and an ECPS integration assertion that the diagnostic emits quantified output.

Validation

• uv run pytest tests/unit/calibration/test_hourly_wage_income_consistency.py -q
• uv run ruff format policyengine_us_data/calibration/sanity_checks.py tests/unit/calibration/test_hourly_wage_income_consistency.py tests/integration/test_enhanced_cps.py
• uv run ruff check policyengine_us_data/calibration/sanity_checks.py tests/unit/calibration/test_hourly_wage_income_consistency.py tests/integration/test_enhanced_cps.py
• git diff --check

Note: I did not run the ECPS integration test locally because enhanced_cps_2024.h5 was not present in the worktree.