fix(ci): restore coverage lane compatibility

backlog/tasks/task-242 - Fix-stats-server-Bun-fallback-in-coverage-lane.md

@@ -0,0 +1,28 @@
+---
+id: TASK-242
+title: Fix stats server Bun fallback in coverage lane
+status: In Progress
+assignee: []
+created_date: '2026-03-29 07:31'
+labels:
+  - ci
+  - bug
+milestone: cleanup
+dependencies: []
+references:
+  - 'PR #36'
+priority: high
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Coverage CI fails when `startStatsServer` reaches the Bun server seam under the maintained source lane. Add a runtime fallback that works when `Bun.serve` is unavailable and keep the stats-server startup path testable.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [ ] #1 `bun run test:coverage:src` passes in GitHub CI
+- [ ] #2 `startStatsServer` uses `Bun.serve` when present and a Node server fallback otherwise
+- [ ] #3 Regression coverage exists for the fallback startup path
+<!-- AC:END -->