feat: add Lit adapter at full matrix parity #20

Job	Run time
Gate (skip full CI for version PRs?)	2s
📖 Docs site (Blume)	1m 7s
🔬 Test	23s
🧰 Build	22s
🧩 Workspace deps	16s
🕵 Lint	13s
✅ Typecheck	31s
💅 Format	17s
🌐 Test (DOM)	49s
🔗 Doc links	8s
🛡 Audit	12s
📦 Pack validation	34s
📏 Bundle size	24s
CI complete	4s
	5m 22s

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