fix(agent): trim unauthenticated /health payload to bare status

[jaredglaser]

Summary

• Agent /health (intentionally unauthenticated) previously returned the agent version, Docker engine/API versions, and ZFS capability detail. It now returns only { status: "healthy" | "unhealthy" } with the same 200/503 semantics, so liveness consumers (agent-updater health-reporter, the agent Dockerfile HEALTHCHECK, worker dev-seed) keep working unchanged.
• Added an authenticated GET /info endpoint on the agent that carries the previous detail payload (agentVersion, Docker and ZFS capabilities). The auth middleware only bypasses /health, so /info requires a valid JWT; a middleware test asserts this.
• Updated the shared contract types in agent/src/types.ts: AgentHealthCheckResponse is now status-only and a new AgentInfoResponse describes /info. The old AgentHealthyResponse/AgentUnhealthyResponse types did not match what the agent actually returned.
• AgentClient.health() now queries /info (it always has a signer) and reads agentVersion.
• checkAgentHealth() in the web app still probes /health for liveness, and accepts an optional token minter to fetch version/Docker version from /info afterward. Failures on /info (no keypair enrolled yet, older agent, network error) never affect the healthy verdict.
• Host server functions (addHost, updateAgent, checkHostHealth) wire a per-host JWT signer into the health check, so agent version reporting in Settings -> Managed Hosts is preserved (and now actually populated; the old code read a version field the agent never sent).
• Updated the agent endpoint table in docs/architecture.md.

Testing

• bun run typecheck and bun run typecheck:agent: pass.
• Agent: full suite bun test --isolate (269 pass), including new handleInfo tests, status-only /health assertions, and a middleware test that /info requires auth.
• Web: agent-health-service.test.ts (liveness plus new authenticated /info paths: bearer token, 401, non-JSON, token minting failure, no /info call when /health fails), agent-client.test.ts (health() hits /info), handlers.test.ts, host-utils.test.ts: all pass.

Closes #230

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 0db629aa-2195-45df-8277-d0d94d506b84

📥 Commits

Reviewing files that changed from the base of the PR and between 5d66d9f and 37fbe05.

📒 Files selected for processing (13)

• agent/src/__tests__/health.test.ts
• agent/src/__tests__/middleware.test.ts
• agent/src/index.ts
• agent/src/routes/health.ts
• agent/src/types.ts
• docs/architecture.md
• src/data/hosts/__tests__/handlers.test.ts
• src/data/hosts/functions.tsx
• src/data/hosts/handlers.ts
• src/lib/clients/__tests__/agent-client.test.ts
• src/lib/clients/agent-client.ts
• src/lib/services/__tests__/agent-health-service.test.ts
• src/lib/services/agent-health-service.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/f3-agent-health-payload

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