giles e112bffe5c Add index-of string primitive: spec, Python, JS, rebootstrap ...

(index-of s needle from?) returns first index of needle in s, or -1.
Optional start offset. Specced in primitives.sx, implemented in both
hand-written primitives.py and bootstrapper templates, rebootstrapped.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-06 09:48:44 +00:00

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