fix(config): fall back to defaults on malformed numeric config values

[lourincedaging0-commits]

what changed: recall.load_config and capture.load_config now route their numeric config values (max_chars, min_observations, dedup_window_seconds) through a small _coerce(value, default, cast) helper instead of a bare int()/float() call, so a malformed value falls back to the default instead of raising.

why: both docstrings already promise "read the <namespace>: stanza; fall back to defaults," and compile.load_config already implements exactly that contract with a _coerce helper (see compile.py:64-70, added for the same reason — a config typo must degrade, not take down every caller). recall.py and capture.py only guarded the yaml read/parse, not the per-field coercion, so a config typo like max_chars: a lot raised an uncaught ValueError straight out of the SessionStart recall hook, and the equivalent typo under capture: crashed any hook-driven observe()/finalize() call. this mirrors the existing, tested pattern rather than introducing a new one.

nothing on disk changes shape — no migration impact, no effect on an existing .vouch/ directory. behavior only changes for the malformed-value case, which previously crashed.

validation commands run:

• .venv/bin/python -m pytest tests/ -q --ignore=tests/embeddings (full suite, all green)
• .venv/bin/python -m mypy src (clean)
• .venv/bin/python -m ruff check src tests (clean)
• confirmed both new regression tests fail with ValueError on the pre-fix code (stashed the src changes, reran) and pass with the fix restored

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