getEffort() warns but accepts unknown effort flags after returning to default; valid 'h' alias not handled

Opus finding

getEffort() warns but accepts unknown effort flags after returning to default; valid 'h' alias not handled

• src/config.ts:136-146

VALID_EFFORTS contains 'h' as a shortcut for high, but getEffort() never explicitly handles 'high' or 'h'. Passing 'high' or 'h' falls through to the default 'return high' which is fine. However, the function uses different membership semantics: only 'low' and 'medium' (and their aliases) trigger explicit returns; everything else (including legitimate 'h' / 'high') is mapped to high silently, which is correct. The real issue is the inconsistent shape: a user passing 'l' returns low, but 'L' or 'LOW' (uppercased) is rejected with a warning and defaulted to high — silently changing the user's intent. Case-sensitivity is undocumented.