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docs: show agents where Studio edits go and how tests build, and let … #19655

Job	Run time
Detect changes	21s
Preflight (lint + format)	50s
Tests on windows-latest: studio-2	6m 48s
Tests on windows-latest: core	5m 43s
Tests on windows-latest: studio-1	9m 23s
Tests on windows-latest: engine-cli	6m 18s
Render on windows-latest	5m 47s
Tests on windows-latest	2s
	35m 12s