fix(cli): report mismatched service status

[kitlangton]

Summary

• replace the misleading URL-or-stopped output from service status with explicit JSON inspection states
• report a coherent healthy daemon as running even when its version differs from the installed CLI
• distinguish registration, reachability, health-format, and registration/health consistency failures
• preserve exact-version discovery and normal-client replacement behavior

service status is an operator-invoked, read-only command. OpenCode does not call it automatically, and inspection never starts, stops, replaces, or signals a process.

States

Status	Observation
stopped	No registration file exists
invalid	Registration is unreadable or malformed
unhealthy	The registered endpoint is unreachable, returns a non-2xx response, or returns invalid health data
legacy	The endpoint reports { "healthy": true } without PID/version identity
inconsistent	Registration and health disagree on PID and/or server version
running	Registration and health agree; compatible compares the reported server version with the installed CLI version

The registration password is used for the health request but is never included in output.

Examples

Healthy but version-mismatched:

{
  "status": "running",
  "url": "http://127.0.0.1:4096",
  "pid": 81804,
  "version": "0.0.0-next-15293",
  "compatible": false,
  "clientVersion": "0.0.0-next-15295"
}

Registration and health disagree:

{
  "status": "inconsistent",
  "fields": ["pid", "version"],
  "registration": {
    "url": "http://127.0.0.1:4096",
    "pid": 81804,
    "version": "0.0.0-next-15293"
  },
  "health": {
    "pid": 81900,
    "version": "0.0.0-next-15295"
  },
  "clientVersion": "0.0.0-next-15295"
}

No registration:

{
  "status": "stopped",
  "clientVersion": "0.0.0-next-15295"
}

Lifecycle Boundary

This PR changes diagnostics only. Service.discover(options) retains its exact-version gate, Service.start(options) still replaces mismatched daemons, and lifecycle operations retain legacy-health support. The client tests explicitly verify gated and ungated discovery after the inspection refactor.

Verification

• bun run test from packages/client: 24 passed
• bun run test test/service.test.ts from packages/cli: 3 passed
• bun typecheck from packages/client: passed
• bun typecheck from packages/cli: passed
• pre-push repository typecheck: 31 package tasks passed

Fixes #36274