feat(mrf): MRF v4 minimal e2e — plumber native-envelope snapshot + reconstruction + gates (S4)#9777

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kevin9foong wants to merge 7 commits into

feat/9743-mrf-step-token-write-guardfrom

feat/9744-mrf-v4-minimal-e2e

Commits on Jul 22, 2026

feat(mrf): wire SUBMISSION_HISTORY_V4_S3_BUCKET compulsory startup var

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feat(mrf): add v4 submission-snapshot store (M6) — schema, parser, S3 writer/reader

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feat(mrf): add v4 native-envelope snapshot producer (M7)

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feat(mrf): add send-time webhook payload policy (M4)

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feat(mrf): add webhook view reconstruction (M3)

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feat(mrf): widen V4 encryption gate by consumer class + flags

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feat(mrf): S3-first snapshot write + v4 payload reconstruction on initial send

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