Phase 3 of deployment-strategies plan. Refactor executeAsync to
dispatch on DeploymentStrategy.fromWire(config.deploymentStrategy()).
Blue-green (default):
- Start all N new replicas (gen-suffixed names coexist with old).
- Wait for ALL healthy (strict — partial-healthy = FAILED, preserves
previous deployment untouched).
- Only then find + stop the previous deployment.
- Final status is always RUNNING; DEGRADED is now reserved for
post-deploy replica crashes (set by DockerEventMonitor).
Rolling: stub — throws UnsupportedOperationException for now, gets
its real implementation in Phase 4.
Refactor details:
- Extract DeployCtx record to carry 13 per-deploy values around.
- Extract startReplica(ctx, i, stateOut) — shared by both strategy paths.
- Extract persistSnapshotAndMarkRunning(ctx, primaryCid) — shared finalizer.
- Rename waitForAnyHealthy → waitForAllHealthy (the name was misleading;
the method already waited for all, just returned partial on timeout).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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