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, 31 insertions, 1 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/ui/app.py b/packages/meshbay-node/src/meshbay_node/ui/app.py
index 3dc320b..dfd9f68 100644
--- a/packages/meshbay-node/src/meshbay_node/ui/app.py
+++ b/packages/meshbay-node/src/meshbay_node/ui/app.py
@@ -116,9 +116,31 @@ def create_ui_app(state: dict) -> FastAPI:
         total_files = sum(idx.count for idx in indexes.values())
         groups_ctx = state.get("groups_ctx", {})
         webrtc = state.get("webrtc")
+        status = state.get("status", "starting")
+
+        needs = []
+        if status == "waiting_for_node_key":
+            needs.append("node_key_link")
+        if status == "running" and not groups_ctx:
+            needs.append("group_add")
+        if status == "running":
+            roster = state.get("roster")
+            if roster:
+                from meshbay_node.roster import Roster
+                members = await roster.list_members()
+                operators = [m for m in members
+                             if m["role"] == "operator" and m["status"] == "active"]
+                if not operators:
+                    needs.append("operator_pair")
+            for gid, gctx in groups_ctx.items():
+                if not gctx.get("gek"):
+                    name = gctx.get("name", gid[:8])
+                    needs.append(f"gek_init:{name}")
+
         return {
             "version": __version__,
-            "status": state.get("status", "starting"),
+            "status": status,
+            "needs": needs,
             "hub_url": state.get("hub_url", ""),
             "username": state.get("username", ""),
             "quic_port": state.get("quic_port", 0),
@@ -129,6 +151,14 @@ def create_ui_app(state: dict) -> FastAPI:
             "pk_node_ed25519": state.get("pk_node_ed25519", ""),
         }
 
+    @app.delete("/api/unlink")
+    async def api_unlink():
+        hub = state.get("hub")
+        if not hub:
+            raise HTTPException(status_code=503, detail="Hub not connected")
+        await hub.unlink_node_key()
+        return {"status": "unlinked"}
+
     @app.get("/api/groups")
     async def api_groups():
         return await _op(lambda: ops.list_groups(state))