perf(scan): literal prefilter + lazy line counting in readAndGrep#804

Merged

BYK merged 8 commits intomainfrom

byk/perf/grep-literal-prefilter

Apr 21, 2026

Commits on Apr 21, 2026

perf(scan): literal prefilter + lazy line counting in readAndGrep
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fix(scan): char-class opaqueness in hasTopLevelAlternation (Cursor #1)
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fix(scan): char-class opaqueness in skipGroup (Cursor #1 followup)
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fix(scan): guard case-insensitive prefilter against Unicode length change (Cursor #2)
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fix(scan): extract literals from compiled regex source, not user input (Cursor #3)
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fix(scan): simplify literal prefilter to file-level gate + fix multi-char escapes (review #4)
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fix(scan): remove unused isPureLiteral (Cursor #4)
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docs(scan): update grep + literal-extract docstrings to match final design
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