Add migration state XML files and update README for clarity #13

Job	Run time
⚙️ Preflight Setup	34s
🧼 Stage 1B · Format	35s
🧪 Stage 1A · Lint	58s
🧱 Stage 2B · HTML Bundle Snapshot	8s
🧱 Stage 2A · JS Bundle Snapshot	7s
🧱 Stage 2C · CSS Bundle Snapshot	18s
🐳 Stage 3 · Docker Image	9s
⚡ Stage 4A · Performance Benchmark	9s
🔦 Stage 5 · Lighthouse Performance	1m 6s
📣 Stage 6 · Deployment Banner	4s
🎉 Stage 7 · Pipeline Summary	2s
	4m 10s

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