Correction overruns its ten-second deadline on repeated-symbol input #136

correct(CorrectionContext(Profile.MS), "ms10tests" + "q" * 122) returns after 14.2 s, not 10 s.

_search_target checks the deadline once per layer and once per 32 yielded views. indel._views skips duplicate edits within a run of one symbol, so some layers do millions of steps between yields. On a 126-character all-q string, the ('I', 'I', 'I', 'AT') traversal runs for 237 s without a single yield.

Found by Codex on #94. The fix is to poll the deadline inside the traversal; _competitors._known_swaps already does this.