fix(receipts): preserve sidecar evidence

[solomonneas]

Summary

• append private, immutable revisions for every worker-results and synthesis emission
• preserve the existing sidecar paths as current projections for legacy readers
• archive exact legacy bytes before resume or patch-reference updates
• keep revision evidence when a later projection write fails

Root cause

Resume and patch-reference binding rewrote worker-results.json and synthesis.json in place. The previous documents were lost even though they were run evidence.

Verification

• ./scripts/verify: 4,662 passed, 3 skipped, 82.93% coverage
• post-rebase focused suite: 244 passed
• independent review: no Critical or Important findings

Closes #567

[coderabbitai]

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