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* feat(skills): exclude_keywords veto in skill activation scoring Add exclude_keywords field to ActivationCriteria. If any exclude keyword is present in the user message, the skill scores 0 regardless of keyword or pattern matches — prevents cross-skill interference. Behaviour: exclude_keywords is a hard veto. Even an exact skill name match gets vetoed if an exclude keyword is also present. This is intentional; partial exclusion (score reduction) would create unpredictable interference behaviour. Example use case: a writing skill with keywords ["write", "draft"] and exclude_keywords ["route", "redirect"] will not activate on messages like "don't route this to the writing agent". Changes: - ActivationCriteria: new exclude_keywords field (serde default) - LoadedSkill: new lowercased_exclude_keywords (preprocessed at load) - selector.rs: early-return 0 in score_skill() on veto match - registry.rs: populate lowercased_exclude_keywords during loading - Test helpers updated across mod.rs, selector.rs, attenuation.rs Co-Authored-By: Claude Opus 4.6 <[email protected]> * Fix review feedback: enforce limits on exclude_keywords, extract helper, use any() - Add exclude_keywords to enforce_limits() with same min-length and cap rules as keywords — prevents empty string always-match and unbounded lists - Extract to_lowercase_vec() helper to deduplicate three identical blocks - Use idiomatic any() iterator instead of for loop in score_skill veto check Co-Authored-By: Claude Opus 4.6 <[email protected]> * test(skills): add exclude_keywords veto tests Adds 4 tests for the exclude_keywords veto behavior as requested in review: 1. test_exclude_keyword_vetos_match — skill scores 0 when exclude keyword present 2. test_exclude_keyword_absent_does_not_block — skill activates normally without it 3. test_exclude_keyword_veto_wins_over_positive_match — veto wins even with multiple keyword hits 4. test_exclude_keyword_case_insensitive — veto fires regardless of message case Also adds make_skill_with_excludes() test helper to avoid repeating the LoadedSkill construction boilerplate in each test. Note on substring matching: exclude_keywords uses message_lower.contains(excl) (substring match), consistent with the existing positive keyword scoring path. This means "red" would veto "redirect". This is documented behaviour — if word-boundary semantics are needed, that's a follow-up change. Co-Authored-By: Claude Sonnet 4.6 <[email protected]> * style: run cargo fmt on selector.rs Co-Authored-By: Claude Sonnet 4.6 <[email protected]> --------- Co-authored-by: Claude Opus 4.6 <[email protected]>