fix(web): keep healthz alive on corrupt proposals

[plind-junior]

fixes review-ui startup timeouts where /healthz crashed while parsing a corrupt pending proposal yaml file, for example yaml.reader.ReaderError: unacceptable character #x0080.

changes:

• make /healthz count pending proposal files in .vouch/proposed/ instead of deserializing every proposal
• keep the detailed queue/api behavior unchanged; unreadable proposal files are still skipped and logged there
• add a regression test that writes the invalid \x80 control character and confirms /healthz remains healthy
• document the review-ui health fix in the changelog

verified:

• /home/a/Dev/plind-junior/vouch/.venv/bin/python -m pytest tests/test_web.py tests/test_web_e2e.py -q
• /home/a/Dev/plind-junior/vouch/.venv/bin/python -m ruff check src/vouch/web/server.py tests/test_web.py
• /home/a/Dev/plind-junior/vouch/.venv/bin/python -m mypy src

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