refactor(management): replace curses TUIs with API-backed ncp subcommands; panel/autostart/install integration

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

management/test_nexus_api.py

@@ -0,0 +1,24 @@
+"""Pin the SSE parser in nexus_api. Run: python management/test_nexus_api.py"""
+import sys, os
+sys.path.insert(0, os.path.dirname(__file__))
+from nexus_api import iter_chunks
+
+# A realistic /chat/stream frame: two token chunks, a meta block, then done.
+lines = [
+    'data: "Hello"', "",
+    'data: " world"', "",
+    "event: meta", 'data: {"model":"mistral"}', "",
+    "event: done", "data: {}", "",
+]
+out = list(iter_chunks(lines))
+assert out == [
+    ("chunk", "Hello"),
+    ("chunk", " world"),
+    ("meta", '{"model":"mistral"}'),
+    ("done", "{}"),
+], out
+# error frame surfaces as its own kind, not a chunk
+assert list(iter_chunks(["event: error", 'data: {"detail":"boom"}'])) == [
+    ("error", '{"detail":"boom"}')
+]
+print("ok")