feat(canopy): shm_size_floor spec + intent-driven floors #372

Job	Run time
Integration (persistent_schemas)	12m 6s
Integration (error_paths)	5m 31s
Integration (switchover)	4m 4s
Integration (lifecycle)	3m 33s
Integration (ttls)	5m 5s
All integrations green	8s
	30m 27s

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