Epic: LFC-aware scaling follow-ups

[sharnoff]

Motivation

With #1003, we have some minor known issues with the LFC-aware scaling implementation. These aren't enough to block merging, but we'd like to fix them eventually.

Tasks

Tasks

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1. Don't require exact 1-minute intervals for working set size metrics
2. Trigger "stuck VMs" if core state is degraded (e.g., missing LFC metrics)
3. Resurrect agent/core: Dependency-inject ScalingAlgorithm #737
4. Make lfcToMemoryRatio required (or, emit warning if not set per VM)

Other related tasks, Epics, and links

• Make metrics LFC number of hits, number of misses and working set size available to autoscaling algorithm #872