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Matthew Meszaros
3609b2b2cd
New method on WorkerAssignmentService picks the least-loaded shared
worker whose risk_pool matches the mailbox's risk band. Three-step
fallback chain:
1. Exact match: same pool, same tier
2. Fall back to clean pool of the same tier when no matching-pool
worker is available (better to land risky mailboxes on clean
workers than refuse; the rebalancer will move them later)
3. Last resort: any worker of the right tier (preserves legacy
behavior for installations that haven't provisioned risky/
quarantine pools)
Existing SelectSharedWorker is unchanged so call sites that don't
know about risk bands keep working. The next commit (background
rebalancer) is the first consumer of the new method.