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docs: adopt four-bucket docs layout and progressive AGENTS index #5007

Job	Run time
CLI Tests (ubuntu-latest)	7m 5s
Frontend Build	6m 15s
DSH Profile Packaging (windows-latest)	1m 2s
Rust Build Check (ubuntu-latest)	9m 33s
Rust Build Check (windows-latest)	21m 9s
Shell Deploy Scripts	18s
Rust Build Check (macos-15)	20m 39s
CLI Tests (macos-15)	7m 25s
	1h 13m 26s