docs: expand LangGraph Basics with 4 agent patterns + streamResource mapping #92

Job	Run time
Cockpit — representative capability smoke	54s
Cockpit — secret-gated integration	51s
Cockpit — e2e	1m 34s
Cockpit — deploy smoke dry-run	47s
Library — lint / test / build	1m 3s
Cockpit — build / test	1m 1s
Website — lint / build	1m 5s
Website — e2e	1m 52s
Chat Agent — smoke	56s
MCP — build / smoke	48s
Deploy → Vercel	0s
	10m 51s

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