ci: restructure CI into PR gate / main sweep / full suite tiers #257

Job	Run time
Layer C — Integration (macOS / apple/container)	-1s
Hermetic Tests (Layer A + B)	-1s
Container Tests Gate	0s
Layer C — Integration (Linux / podman)	-10s
Layer D — E2E (Linux / docker)	-10s
Layer E — Fuzz (libfuzzer)	-11s
	-33s

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