ci: bound assurance work and qualify release evidence

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Summary

• replace impractical RSA Miri private operations with focused unsafe-boundary proofs
• separate routine Weekly assurance from explicit exact-commit release qualification and retained raw CT evidence
• preserve the complete compile contract while executing only behavior-changing feature profiles
• parallelize independent fuzz targets with isolated corpus and artifact ownership
• reduce AMX cache weight without discarding caches that produce measured compute savings

Validation

• just push-full
• just check
• just test --all
• focused RSA Miri: 3/3
• compile feature matrix: 58/58
• executable feature matrix: 8/8
• CI ownership, dispatcher, fuzz scheduler, release-evidence, and CT evidence regression suites

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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