feat(agentos): registry ObjectId addressing, cascade delete, session-… #17

Job	Run time
build (computeragent-server, examples/Dockerfile.harness, examples/computeragent-server.ts, harness)	4m 59s
build (harness-server, examples/Dockerfile.harness, examples/harness-server.ts, harness)	4m 35s
build (agentos-server, packages/agentos-server/Dockerfile)	1m 29s
build (agentos-spa, agentos/Dockerfile, spa)	18s
	11m 21s

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