feat: add @cacheplane/render and @cacheplane/chat libraries #113

Job	Run time
Library — lint / test / build	1m 20s
Cockpit — secret-gated integration	1m 12s
Website — lint / build	1m 40s
Cockpit — representative capability smoke	1m 14s
Cockpit — build all examples	1m 34s
Cockpit — build / test	1m 29s
Cockpit — deploy smoke dry-run	1m 9s
Website — e2e	2m 0s
Cockpit — e2e	2m 38s
MCP — build / smoke	1m 11s
Chat Agent — smoke	1m 14s
Deploy → Vercel	0s
	16m 41s

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