fix(stats): harden server lifecycle and verify compiled runtime (#261)

changes/ci-test-deduplication.md

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+type: internal
+area: ci
+
+- Removed duplicate source and launcher smoke executions from the reusable quality gate while preserving every distinct test lane and failure artifact.

changes/compiled-runtime-smoke.md

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+type: internal
+area: verification
+
+- Replaced mislabeled dist source reruns with a small Electron-runtime smoke check for compiled stats startup, HTTP service, native SQLite, port conflicts, and cleanup.

changes/fix-stats-server-lifecycle.md

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+type: fixed
+area: stats
+
+- Stats server startup reports port conflicts without crashing SubMiner, shares concurrent startup requests, and shows in-app startup errors through configured status notifications.
+- Background stop cancels pending background startup without disconnecting foreground-only dashboards. Shutdown bounds the wait for active HTTP requests and awaits tracker finalization before exit, with a deadline for forced application exit.