[littlehand26]

Cronos v1.8 writers need continuous block sync on the v0.39 release line. Preserve that mode on the exact Cronos baseline 14b7b93046e3, with validator/adaptive-mode rejection and peer-height metrics.

Fix the mempool broadcast goroutine leak exposed by continuous sync: disconnected peers now exit the sync wait, and peer/reactor shutdown also ends the peer-state wait. This releases the goroutine references without requiring a switch to consensus. Continuous sync and normal transaction propagation semantics are preserved.

Validation with Go 1.25.11:

• go test ./config ./blocksync ./node passed for the continuous-sync port.
• The new disconnect/peer-state lifecycle regressions fail against the original implementation.
• go test ./mempool -count=1 -timeout=5m passed.
• New lifecycle and post-sync broadcast tests passed under -race -count=20, including 20 disconnect cycles per run.
• go vet ./mempool, golangci-lint v2.11.3 on ./mempool/..., formatting and diff checks passed.
• Independent Codex/Kimi review and cross-check found no confirmed newly introduced P0/P1/P2 issue.

The deterministic sync-release/disconnect race and saturated gossip semaphore paths have not been exercised by the new tests. The pre-existing semaphore loop does not respond to stopping only the reactor while its peer remains running. No production rollout is included.

I hereby certify that my contribution is in accordance with the Developer Certificate of Origin (https://developercertificate.org/).

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• 6136228 — feat(blocksync): port continuous sync to Cronos v0.39

[github-actions]

🔒 WARNING: unsigned commits detected

This pull request contains 2 commit(s) without a verified signature.

How to fix:

1. Set up commit signing (GPG or SSH).
2. Amend/rebase so every commit in this PR is verified-signed.
3. Push the updated branch and open a new PR, or ask a maintainer to reopen once fixed.

Docs: https://docs.github.com/authentication/managing-commit-signature-verification

Unsigned commits:

• 6136228 — feat(blocksync): port continuous sync to Cronos v0.39
• 6a2f431 — fix(mempool): stop broadcast routines for disconnected peers