Validate order book delta updates

[ringotokens-commits]

Zeroeye Go Delta Bounty PR Draft

Issue: #4

Patch: /Users/aiagent/Documents/Codex/2026-07-08/yo/outputs/zeroeye_go_delta_bounty.patch

Diagnostic artifacts:

• /Users/aiagent/Documents/Codex/2026-07-08/yo/outputs/zeroeye_go_build-2b54872c.json
• /Users/aiagent/Documents/Codex/2026-07-08/yo/outputs/zeroeye_go_build-2b54872c.logd

Diagnostic password:

81a9fcc6d4ece0560923

Summary

Adds deterministic order-book snapshot and delta validation coverage for malformed payloads, stale/out-of-order sequences, checksum mismatch rollback, and valid snapshot-to-live-delta recovery.

Changes

• Added ApplySnapshot and ApplyDelta helpers to market/orderbook.
• Added sequence tracking access with Sequence().
• Added deterministic checksum generation for post-delta validation.
• Rejects invalid symbol, side, sequence, price, and quantity values before mutating book state.
• Rejects stale/out-of-order deltas without mutating bids, asks, or sequence.
• Rolls back state when a checksum-style mismatch is detected after applying a candidate delta.
• Added macos-x64 encryptly platform mapping so diagnostics can be generated on Intel macOS when the binary is available.
• Added focused tests for valid snapshot plus deltas, malformed delta payloads, stale/out-of-order deltas, checksum mismatch rollback, and malformed snapshots.

Testing

PATH=/Users/aiagent/Documents/Codex/2026-07-08/yo/work/go-toolchain/go/bin:$PATH \
GOCACHE=/Users/aiagent/Documents/Codex/2026-07-08/yo/work/go-cache \
GOMODCACHE=/Users/aiagent/Documents/Codex/2026-07-08/yo/work/gomodcache \
go test ./market/orderbook ./market/matching ./market/ws

Result:

ok  	github.com/tent-of-trials/market/orderbook	0.810s
?   	github.com/tent-of-trials/market/matching	[no test files]
?   	github.com/tent-of-trials/market/ws	[no test files]

python3 build.py

Result:

• Backend/Rust: PASS
• Frontend: PASS
• Market/Go: PASS
• v2-market-stream: PASS
• Diagnostic artifacts generated:
  • diagnostic/build-2b54872c.json
  • diagnostic/build-2b54872c.logd
• Full multi-language build exits 1 locally because this machine lacks cmake, luac, ghc, and Java runtime, and the existing C frailbox module has a compile error.

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally
• Diagnostic build log is committed in this PR
• Documentation has been updated, if applicable
• Configuration or schema changes are documented, if applicable
• No generated build artifacts are committed, except the required diagnostic build log
• Changes are scoped to the PR purpose and avoid unrelated cleanup
• Security, privacy, and error-handling implications have been considered

---

• I would like to request that my diagnostic build log is removed before merging

/claim #4