Note

Medium Risk
Mostly CI/test-only, but adds new shutdown paths for HTTP and libp2p that could affect resource cleanup and port reuse if invoked outside tests.

Overview
Adds a new CI workflow (check-package-lock.yml) that fails builds when package-lock.json is missing/empty, and when package.json changes without an accompanying lockfile update; it also validates lockfile sync via npm ci --dry-run.

Improves BDD test stability by adding redis to the checks.yml service stack and by implementing explicit teardown: ExpressHttpClient/HttpClientModuleManager now support close(), Libp2pService/NetworkModuleManager support stop(), and MockOTNode.stop() shuts down the command executor, HTTP server, libp2p, and background intervals (with shared cleanupBlockchainIntervals used by ProofingService and ClaimRewardsService). Test hooks were updated to await orderly node shutdown, make triple store cleanup best-effort, and ignore a couple expected libp2p unhandled-rejection codes in the test environment.

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