fix(scheduler): Resolve CI module export error in lock-utils

- Fix `SyntaxError: The requested module './lock-utils.mjs' does not provide an export named 'withTimeout'` by refactoring exports in `src/lock-utils.mjs`.
- Explicitly import `relayListLabel` and `mergeRelayList` from `src/utils.mjs` before exporting them to avoid ambiguous export behavior in some environments.

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

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

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

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

@@ -0,0 +1,18 @@
+---
+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