Docs: Add no-emdash / ASCII-only rule to AGENTS.md#16653
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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Adds a Boundaries rule to AGENTS.md: never use em-dashes (U+2014) or other non-ASCII Unicode characters in source code, except in tests or sample data that specifically exercise Unicode or UTF handling.
Why
This came up in review of #16500, where em-dashes introduced as AI artifacts had to be removed from the diff by hand. Capturing the convention in AGENTS.md gives agents and contributors one place to learn it, so the cleanup does not recur per PR. See the review thread: #16500 (comment)