Each quiesce window now backs up ONLY the first due tier that starts and
resumes the apps at its snapshotted; the upload finishes with the apps
running. Any other due tier stays due and a later cycle (the next poll)
takes it in its own short window - never straight after the first.
This reverses R-82's 'ONE quiesce window for both due tiers'.
A manual press (TriggerNow) backs up the primary (local) tier only, picked
by the agent's Primary flag; the off-site tier follows at the next
scheduled night run. If no available tier is flagged primary, the first
available tier is backed up rather than nothing.
Unchanged: marker written before any stop, one unquiesce per window, the
max-quiesce bound, BUSY/start-error handling (the next tier is still tried
in the same window when a tier does not start), breaker and contention.
Tests: TestBothTiersDue_ExactlyOneQuiesceWindow ->
TestBothTiersDue_FirstCycleRunsOnlyFirstTier; TestNonLastTierSnapshot_
DoesNotResumeApp -> TestFirstTierSnapshot_ResumesAppWhileUploadContinues
(red on old code); new TestManualPress_RunsOnlyLocalTier (red on old
code), TestLeftoverTier_RunsInNextCycleInItsOwnWindow,
TestManualRunTiers_NoPrimaryAvailable_BacksUpFirstAvailable;
TestNotify_BothFailingTiersAreReported now runs two cycles.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS
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