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feat: richer symbol metadata — signatures, JSDoc, type members, call graph #75

Job	Run time
Gate (skip full CI for version PRs?)	2s
📊 Benchmark (fixture)	9s
🧰 Build	11s
🕵 Lint	7s
✅ Typecheck	11s
🔬 Test	9s
💅 Format	10s
CI complete	2s
	1m 1s