Add agent service tests

[devdattatalele]

Adds vitest coverage for the agent module services.

agent.test.ts (14 tests) — listAgents (scoping, voyager search, filter passthrough), getAgentById, createAgent, updateAgent (tenant check, identity-actor flow), upsertAgent (hash hit, slug generation, P2002 race retry, error propagation), archiveAgent.

agentClient.test.ts (10 tests) — listAgentClients (scoping, whitespace search, voyager), getAgentClientById, upsertAgentClient (OAuth registration vs system_client, new-vs-existing index queue), createAgentClient.

agentInstance.test.ts (7 tests) — listAgentInstances (tenant check, filter passthrough), getAgentInstanceById, upsertAgentInstance (registration/client mismatch, tool_call constraint, hash + upsert).

Mocking pattern mirrors tenant/environment.test.ts and monitor/alert.test.ts (vi.mock @metorial-subspace/db, @lowerdeck/service, @lowerdeck/pagination). Source unchanged.

31 tests, prettier-clean.

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Note

Low Risk
Test-only additions with no runtime or API behavior changes.

Overview
Adds Vitest unit tests for the agent module’s three service layers (agent, agentClient, agentInstance) with no production code changes.

agentService (~14 tests): list scoping and Voyager search/filter passthrough; get-by-id not-found handling; create/update/archive flows through identity actors and checkTenant; upsert hash short-circuit, slug generation, Prisma P2002 race retry, and error propagation.

agentClientService (~10 tests): list scoping and search (including whitespace-only search skipped); OAuth registration on mcp_client_oauth vs none for system_client; post-transaction search indexing only on new upserts; createAgentClient delegating to upsert.

agentInstanceService (~7 tests): tenant checks and filters on list/get; upsert validation (registration/client mismatch, tool_call agent type constraint); hash-based agentOid_hash upsert.

Mocks follow the same pattern as other subspace service tests (@metorial-subspace/db, @lowerdeck/service, @lowerdeck/pagination, plus module-specific deps).

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[devdattatalele]

@herber are their any CLA Document to be signed before submitting pr?