feat(spa): home chat routing, registry delete, greeting polish #8

Job	Run time
build (computeragent-server, examples/Dockerfile.harness, examples/computeragent-server.ts, harness)	16s
build (agentos-server, packages/agentos-server/Dockerfile)	28s
build (agentos-spa, agentos/Dockerfile, spa)	38s
build (harness-server, examples/Dockerfile.harness, examples/harness-server.ts, harness)	17s
	1m 39s

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