feat(churn): git churn ingest and churn-complexity-hotspots recipe (#… #784

Job	Run time
Gate (skip full CI for version PRs?)	2s
🔬 Test	55s
🧰 Build	20s
🕵 Lint	6s
✅ Typecheck	12s
🤖 Action smoke (dogfood)	13s
📊 Benchmark (fixture)	15s
💅 Format	18s
🛡 Audit (non-blocking)	16s
CI complete	2s
🕵 Lint	11s
🔬 Test	55s
📊 Benchmark (fixture)	15s
Gate (skip full CI for version PRs?)	2s
💅 Format	18s
✅ Typecheck	12s
🧰 Build	20s
🛡 Audit (non-blocking)	16s
🤖 Action smoke (dogfood)	13s
CI complete	2s
	5m 23s

Provide feedback