Rename MCP server identifier from state-hub to dev-hub

Introduce canonical MCP_SERVER_NAME constants, shared registration helpers,
and a migrate_mcp_config.py script for ~/.claude.json upgrades. Registration,
patch, and custodian CLI checks accept both dev-hub and legacy state-hub during
transition. API root metadata and session-protocol template reflect the new name.

tests/test_mcp_registration.py

@@ -0,0 +1,74 @@
+"""Tests for dev-hub MCP registration helpers and config migration."""
+from __future__ import annotations
+
+import json
+
+import mcp_server.server as server
+from mcp_server.constants import LEGACY_MCP_SERVER_NAME, MCP_SERVER_NAME
+from scripts.mcp_registration import (
+    mcp_server_registered,
+    resolve_mcp_server_name,
+)
+from scripts.migrate_mcp_config import migrate_config
+
+
+def test_mcp_server_name_is_dev_hub() -> None:
+    assert server.mcp.name == MCP_SERVER_NAME
+
+
+def test_mcp_server_registered_accepts_dev_hub() -> None:
+    config = {"mcpServers": {MCP_SERVER_NAME: {"type": "sse"}}}
+    assert mcp_server_registered(config) is True
+
+
+def test_mcp_server_registered_accepts_legacy_state_hub() -> None:
+    config = {"mcpServers": {LEGACY_MCP_SERVER_NAME: {"type": "sse"}}}
+    assert mcp_server_registered(config) is True
+
+
+def test_resolve_mcp_server_name_prefers_dev_hub() -> None:
+    config = {
+        "mcpServers": {
+            MCP_SERVER_NAME: {"type": "sse"},
+            LEGACY_MCP_SERVER_NAME: {"type": "sse"},
+        }
+    }
+    assert resolve_mcp_server_name(config) == MCP_SERVER_NAME
+
+
+def test_migrate_config_renames_legacy_entry() -> None:
+    legacy_entry = {"type": "sse", "url": "http://127.0.0.1:8001/sse"}
+    config = {"mcpServers": {LEGACY_MCP_SERVER_NAME: legacy_entry}}
+    migrated, changed = migrate_config(config)
+    assert changed is True
+    assert LEGACY_MCP_SERVER_NAME not in migrated["mcpServers"]
+    assert migrated["mcpServers"][MCP_SERVER_NAME] == legacy_entry
+
+
+def test_migrate_config_noop_when_dev_hub_present() -> None:
+    config = {"mcpServers": {MCP_SERVER_NAME: {"type": "sse"}}}
+    migrated, changed = migrate_config(config)
+    assert changed is False
+    assert migrated is config
+
+
+def test_migrate_config_noop_when_neither_present() -> None:
+    config = {"mcpServers": {"ops-bridge": {"type": "sse"}}}
+    migrated, changed = migrate_config(config)
+    assert changed is False
+    assert migrated is config
+
+
+def test_migrate_config_preserves_other_servers(tmp_path) -> None:
+    claude_json = tmp_path / ".claude.json"
+    config = {
+        "mcpServers": {
+            LEGACY_MCP_SERVER_NAME: {"type": "sse"},
+            "ops-bridge": {"type": "sse", "url": "http://127.0.0.1:8002/sse"},
+        }
+    }
+    claude_json.write_text(json.dumps(config))
+    migrated, changed = migrate_config(json.loads(claude_json.read_text()))
+    assert changed is True
+    assert "ops-bridge" in migrated["mcpServers"]
+    assert migrated["mcpServers"]["ops-bridge"]["url"] == "http://127.0.0.1:8002/sse"