fix(translation): share Retry-After cooldown and preserve request isolation - #991

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Keep native-batch configuration, recovery and shared real-attempt quota contracts. Capture input sender privacy before awaiting readiness and attach control to the same request.

Preserve the original standard userscript budget with CommonJS determinism and exclusion of unavailable image/area settings; relay the existing video-state query protocol. Validate 606 distinct targeted cases, compile, audit, standard verifier, Chrome/Firefox and manifests. Standalone builds but the original 3,600,000-byte gate fails at 3,816,337 bytes.

Bind the 606 targeted cases, original standard verifier, extension builds and current size ablation to the verified source. Record five distinct gzip hypotheses, unchanged decoded bytes and limits. Retain the original standalone budget failure and historical report bytes.

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Rebase tree on current main while retaining branch history. Include 24 targeted audit cases. Final affected rerun: 93 regression plus 2 fixed image assertions pass; aggregate unique evidence 598/600, with two reproduced baseline stats failures. Narrow types retains two baseline diagnostics, no added diagnostics. No browser/model acceptance or merge.

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