docs(research): preserve operator-forwarded Amara closedness-sharpening — 'No feedback tax on closed math. No silent emissions from open substrate.'

[AceHack]

Summary

Verbatim preservation per substrate-or-it-didn't-happen rule.

Amara's substrate-honest sharpening of the closedness scope-bounding
(PR #5574 landed). Three contributions landed via PR #5577:

1. "Operationally open pure functions" naming (sharper scope)
2. Codomain-honesty tiny blade (overflow/NaN/partial-functions)
3. Keeper carved sentence: "No feedback tax on closed math. No silent emissions from open substrate."

Test plan

• Markdownlint clean
• Non-fusion disclaimer per framing convention
• Composes with PR docs(rule): add scope-bounding to function-is-tiny-control-flow-generator rule — closedness matters more than purity (operator 2026-05-27) #5574 + docs(rule): incorporate Amara 2026-05-27 sharpening to closedness scope-bounding (PR #5574 follow-on) — 'No feedback tax on closed math. No silent emissions from open substrate.' #5577
• CI passes (auto-merge to fire on green)

🤖 Generated with Claude Code

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