Listing filters

@cavuno/board/filters is the shared vocabulary and parser for every job listing route, including category, skill, and location pages. Display labels live in @cavuno/board/format; search POST bodies use jobs.search; typeahead UI behavior lives in cavuno-board-search-suggestions.

Parse public URL input

Run every listing URL through parseListingFilters. Public input is permissive: unknown values are dropped and parsing does not throw. Seniority and company accept repeated parameters or comma-separated strings, then trim, lowercase, deduplicate, and preserve order. Company is an open set of public slugs capped at the first 10 values.