Jesse Vincent 038abed026 fix: replace O(n^2) escape_for_json with parameter substitution ...

The character-by-character loop using ${input:$i:1} was O(n^2) in
bash due to substring copy overhead. On Windows Git Bash this took
60+ seconds, freezing terminal input even with async hooks.

Replaced with bash parameter substitution (${s//old/new}) which runs
each pattern as a single C-level pass. 7x faster on macOS, expected
to be dramatically faster on Windows Git Bash where the original
caused the worst hangs.

Relates to #404, #413

2026-02-05 11:38:06 -08:00

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