Brummel
1fded48142
Pins the property that the `--chapters` CLI token list normalizes
to the zero-padded chapter-tag form ("01".."22") that Filter::accepts
compares against, so "4" filters identically to "04", and any token
mapping to no known chapter is surfaced as unrecognised (for a stderr
warning) rather than silently collapsing the result set to empty.
RED: alpha_id::model::normalize_chapters does not exist yet — the
test fails to compile. The GREEN side follows in the next commit.
refs #1
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>