DX: grove doctor command + improved operator diagnostics

[windoliver]

Summary

Operators and agents frequently hit silent configuration issues. A grove doctor command would surface problems before they cause confusion.

Motivation

From the DX audit:

• Goal/session MCP tools fail silently when goalSessionStore isn't wired (DX: fix goalSessionStore not wired in stdio MCP, normalize error formats #214)
• Nexus connectivity issues only surface at grove up time
• Agent identity env vars (GROVE_AGENT_ID, etc.) are invisible until something fails
• MCP tool availability depends on preset/mode, but there's no way to check what's enabled
• The nexus-lifecycle.ts file currently has unresolved git conflict markers on main

Proposed: grove doctor

$ grove doctor

Grove Environment
  .grove directory:     /Users/alice/project/.grove ✓
  grove.db:             exists (1.2 MB) ✓
  CAS:                  .grove/cas/ (47 artifacts) ✓
  GROVE.md:             valid v3 contract ✓
  grove.json:           preset=review-loop, backend=nexus ✓

Agent Identity
  GROVE_AGENT_ID:       claude-worker-1 ✓
  GROVE_AGENT_ROLE:     researcher ✓
  GROVE_AGENT_PLATFORM: claude-code ✓

Services
  HTTP server:          http://localhost:4515 ✓ (responding)
  MCP server:           not configured (preset has services.mcp: false)
  Nexus:                http://localhost:2026 ✓ (healthy)
  API key:              sk-****7f3a (from nexus.yaml) ✓

MCP Tools (for current mode)
  Contributions:        grove_submit_work, grove_submit_review, ... (6 tools) ✓
  Claims:               grove_claim, grove_release, grove_list_claims ✓
  Queries:              grove_frontier, grove_search, ... (6 tools) ✓
  Goals:                ✗ goalSessionStore not configured
  Bounties:             enabled (evaluation mode) ✓

Gossip
  Peers:                not configured (no GOSSIP_SEEDS)

Issues Found:
  ⚠ Goal/session tools will return NOT_CONFIGURED — see #214
  ⚠ GROVE_AGENT_NAME not set (optional but recommended)

Implementation

• New standalone CLI command in src/cli/commands/doctor.ts
• Checks: file existence, contract parse, Nexus health, env vars, port connectivity
• --json output for scripting
• Could also serve as the basis for a health panel in the TUI

Additional diagnostics improvements

• grove status --json already exists but could include doctor-level checks
• MCP tools could include a grove_doctor tool so agents can self-diagnose
• TUI status bar could surface top-priority doctor warning

[yinghaowuzhanbai]

I'd like to work on this. Could you add me as a collaborator so I can assign it to myself? My GitHub handle is yinghaowuzhanbai.
Thank you