Harden the 'wake id rotates' assertion in scheduled-compose.integration.test.ts to quiescence

[schickling-assistant]

Problem

scheduled-compose.integration.test.ts has a polling-race flake in the wake id rotates assertion: it samples the rotating wake id while the poll loop is still advancing, so under parallel CPU load the observed id can be a cycle ahead/behind the expectation. Same class of issue as the earlier recurrence-count flake fix.

Fix

• Harden the assertion to wait for quiescence (the loop reaching a stable, settled state) before sampling the wake id, rather than reading it mid-flight — mirroring the recurrence-flake hardening.

Refs #757.

Posted on behalf of @schickling

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