docs: remove experimental-gating design doc
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The design doc lived under a gitignored path and was only force-added; drop it from the PR. Behavior is documented in CLAUDE.md.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: 01KXG6YE6S6KMWJFR3F6MVTP60
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