fix(lint): resolve duplicate exports and consolidate utilities

- `src/lock-utils.mjs`: Removed duplicate definition of `mergeRelayList` (already re-exported).
- `src/lock-publisher.mjs`: Removed duplicate definitions of `secureRandom`, `withTimeout`, and `MAX_RANDOM`. Now imports them from `src/lock-utils.mjs`. Removed unused `randomInt` import.
- `src/lock-ops.mjs`: Removed duplicate import of `relayListLabel` and local definition of `withTimeout`.
- `test/utils.test.mjs`, `test/utils-async.test.mjs`: Updated imports to point to `src/lock-utils.mjs` for moved utilities.

Verified locally with `npm run lint` and `npm test`.

Co-authored-by: PR0M3TH3AN <[email protected]>

task-logs/daily/.scheduler-run-state.json

@@ -1,4 +0,0 @@
-{
-  "run_date": "2026-02-20",
-  "lock_deferral": null
-}

task-logs/daily/2026-02-20T21-46-47Z__scheduler-update-agent__failed.md

@@ -1,18 +0,0 @@
----
-cadence: daily
-agent: scheduler-update-agent
-status: failed
-reason: 'Prompt/handoff execution failed'
-detail: 'Handoff callback failed.'
-created_at: 2026-02-20T21:46:47.102Z
-timestamp: 2026-02-20T21:46:47.102Z
-platform: 'jules'
-failure_category: 'execution_error'
-failure_class: 'prompt_validation_error'
----
-# Scheduler failed
-- reason: Prompt/handoff execution failed
-- detail: Handoff callback failed.
-- platform: jules
-- failure_category: execution_error
-- failure_class: prompt_validation_error