fix(agentos-server): fall back to _id lookup in /agents/resolve #32

Job	Run time
build (agentos-server, packages/agentos-server/Dockerfile)	1m 41s
build (computeragent-server, examples/Dockerfile.harness, examples/computeragent-server.ts, harness)	5m 38s
build (agentos-spa, agentos/Dockerfile, spa)	32s
build (harness-server, examples/Dockerfile.harness, examples/harness-server.ts, harness)	4m 38s
	12m 29s

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