Add dor identify: cmux-inspired JSON identity dump

[nedtwigg]

Summary

Adds a dor identify command: a JSON dump of where the invoking terminal sits within Dormouse and which app is hosting it.

{
  caller: {
    is_browser_surface: false,
    pane_ref: pane:1,
    surface_ref: surface:1,
    surface_type: terminal,
    window_ref: window:1,
    workspace_ref: workspace:1
  },
  cli_js_path: /path/to/dor-cli/dist/dor.js,
  focused: { ... },
  host: vscode,
  host_workspace: /path/to/project,
  node_path: /path/to/node
}

Design decisions

• No new control method — composes over the existing surface.list, which already carries ids, refs, focus, and workspace/window refs; the caller is matched locally against DORMOUSE_SURFACE_ID.
• Always JSON, alphabetical snake_case keys. --id-format refs|uuids|both per the handle-model invariant.
• Host identity via new public PTY env — DORMOUSE_HOST (vscode | standalone) injected by each host, and DORMOUSE_HOST_WORKSPACE (VS Code only: the owning window''s .code-workspace file when loaded, else its first workspace folder).
• No socket in the output — the CLI is the public API and the control socket is private host plumbing; unlike cmux there is no socket API to advertise. A snapshot test proves the field stays absent even when DORMOUSE_CONTROL_SOCKET is set.
• Nullable fields — caller is null when the invoking surface is not visible (e.g. minimized to a Door); env-derived fields are null when the variable is absent (e.g. an older host).

Also fixes scripts/spec-lint.mjs on Windows (pre-existing): URL.pathname produced C:\C:\... roots, and backslash joins broke the index-completeness comparison against forward-slash paths in the markdown.

Testing

• 4 CLI output tests + snapshots (json, --id-format both, no-env, invisible caller); help snapshots regenerated — all 68 dor tests pass.
• pnpm lint:specs passes (now also on Windows); vscode-ext build and cargo check pass.
• Verified end-to-end against a live Dormouse VS Code host: caller/focused resolved over the real control socket.

🤖 Generated with Claude Code

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