fix: upload reliability hardening -- retry, fault tolerance, spill cleanup#26

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grumbach wants to merge 12 commits intomainfrom

fix/payment-upload-hardening

Commits on Apr 2, 2026

fix: validate data_size on merkle candidate responses and fix direct indexing
grumbach
committed
fix: over-query 2x peers for quote collection fault tolerance
grumbach
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fix: add upload retry with exponential backoff and partial progress tracking
grumbach
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fix: preserve partial proofs on multi-batch merkle payment failure
grumbach
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fix: concurrent external signer quote collection and correct payment mode
grumbach
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fix: review fixes -- AlreadyStored from close group only, partial merkle error, log accuracy
grumbach
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test: add upload cost comparison table and 8GB memory test
grumbach
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fix: use 20 nodes for merkle, separate files to avoid AlreadyStored
grumbach
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test: upload cost comparison table (release mode, smaller sizes)
grumbach
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fix: move chunk spill from temp dir to data dir with stale cleanup
grumbach
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fix: harden spill dir cleanup with lockfile, symlink protection, and prefix
grumbach
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fix: clippy div_ceil and fmt in upload costs test
grumbach
committed