feat: implement string.at() method with negative index support#255
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Summary
String.at()ES2022 method — likecharAt()but supports negative indicess.at(-1)returns last character,s.at(-2)returns second-to-last, etc.Test plan
strings/string-at.tscovers positive, negative, and OOB indicesnpm run verify:quickpasses (tests + Stage 1 self-hosting)🤖 Generated with Claude Code