feat: node workflow redesign — wizard auto-config, reset, MusicBrainz contact

Wizard (Electron):
- Auto-provisions node config (hub URL + username) from logged-in user
- node:start handles both cold start and restart of misconfigured daemon
- Waits for daemon to reach 'running', auto-links node key on hub
- probeNode accepts intermediate states for wizard progress feedback

Reset (meshbay-node reset):
- Unlinks node key from hub (DELETE /me/node_key, best-effort)
- Stops and disables daemon (systemctl --user disable --now)
- Erases ~/.config/meshbay, ~/.local/share/meshbay, ~/.local/state/meshbay

MusicBrainz contact:
- Resolved from owner's hub email instead of per-node roster config
- Removed musicbrainz_contact UI and WebRTC handshake field
- Removed set_musicbrainz_contact/musicbrainz_contact from roster

Node pairing:
- Added operator pairing banner on NodePage
- Added operator_paired flag to list_groups

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/hub_client.py b/packages/meshbay-node/src/meshbay_node/hub_client.py
index 92c39db..1a746bd 100644
--- a/packages/meshbay-node/src/meshbay_node/hub_client.py
+++ b/packages/meshbay-node/src/meshbay_node/hub_client.py
@@ -41,6 +41,7 @@ class HubSession:
     refresh_token: str
     hub_pk_pem:    bytes         # cached hub Ed25519 public key
     node_id:       str = ""
+    email:         str = ""
     _token_exp:    int = 0
 
     @property
@@ -203,6 +204,27 @@ class HubClient:
         r.raise_for_status()
         return r.json().get("groups", [])
 
+    # ── Owner profile ────────────────────────────────────────────────────────
+
+    async def fetch_owner_email(self) -> str:
+        """Fetch the authenticated user's email from the hub."""
+        if self._session is None:
+            raise RuntimeError("Not logged in")
+        await self.ensure_fresh_token()
+        r = await self._http.get("/v1/users/me",
+                                 headers=self._session.auth_headers)
+        r.raise_for_status()
+        return r.json().get("email", "")
+
+    async def unlink_node_key(self) -> None:
+        """Clear pk_node_ed25519 on the hub (best-effort before reset)."""
+        if self._session is None:
+            return
+        await self.ensure_fresh_token()
+        r = await self._http.delete("/v1/users/me/node_key",
+                                    headers=self._session.auth_headers)
+        r.raise_for_status()
+
     # ── User pubkey lookup ────────────────────────────────────────────────────
 
     async def get_user_pubkeys(self, username: str) -> dict: