feat(agentos): group-scoped encrypted git PATs + GAP source SHA sync #25

Job	Run time
build (agentos-server, packages/agentos-server/Dockerfile)	2m 42s
build (agentos-spa, agentos/Dockerfile, spa)	40s
build (harness-server, examples/Dockerfile.harness, examples/harness-server.ts, harness)	4m 44s
build (computeragent-server, examples/Dockerfile.harness, examples/computeragent-server.ts, harness)	5m 14s
	13m 20s

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