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docs: adopt four-bucket docs layout and progressive AGENTS index #4992

Job	Run time
Rust Build Check (ubuntu-latest)	10m 40s
Frontend Build	5m 46s
DSH Profile Packaging (windows-latest)	39s
CLI Tests (macos-15)	8m 38s
Rust Build Check (macos-15)	16m 44s
Rust Build Check (windows-latest)	20m 24s
CLI Tests (ubuntu-latest)	7m 45s
Shell Deploy Scripts	12s
	1h 10m 48s