- extend filter.Options with sort mode support and keep Apply as a single-pass pipeline with limit behavior preserved for unsorted flows
- add sort normalization and two ordering strategies:
* savings: rank by computed DealScore with deterministic title tie-break
* ending: rank by earliest parsed end date, then DealScore fallback
- introduce DealScore heuristics that combine BOGO weighting, dollar-off extraction, and percentage extraction from savings/deal-info text
- add category synonym matcher that supports:
* direct case-insensitive matches
* canonical group synonym expansion (e.g. veggies -> produce)
* normalized fallback for hyphen/underscore/plural variants without breaking exact unknown-category matching
- include explicit tests for synonym matching, hyphenated category handling, unknown plural exact matching, and sort ordering behavior
- keep allocation-sensitive behavior intact while adding matcher precomputation and fast-path checks
teernisse
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