feat: discover Claude Code project .mcp.json configs as profiles (#53)

Closes #53

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_core.py

@@ -67,6 +67,64 @@ def test_legacy_settings_json_surfaced_only_with_servers(fake_home):
     assert any("legacy" in p.label for p in c.discover_profiles())
 
 
+def test_project_with_mcp_json_is_discovered(tmp_path):
+    proj = tmp_path / "my-project"
+    proj.mkdir()
+    (proj / ".mcp.json").write_text('{"mcpServers": {"x": {"command": "npx"}}}')
+    claude_json = tmp_path / ".claude.json"
+    claude_json.write_text(json.dumps({"projects": {str(proj): {}}}))
+
+    profs = c.discover_project_configs(claude_json)
+    assert len(profs) == 1
+    assert profs[0].label == f"Project: {proj.name}"
+    assert profs[0].path == proj / ".mcp.json"
+    assert profs[0].config_exists
+
+
+def test_project_without_mcp_json_not_listed(tmp_path):
+    proj = tmp_path / "no-mcp-project"
+    proj.mkdir()
+    claude_json = tmp_path / ".claude.json"
+    claude_json.write_text(json.dumps({"projects": {str(proj): {}}}))
+
+    assert c.discover_project_configs(claude_json) == []
+
+
+def test_projects_missing_or_not_dict_yields_no_profiles(tmp_path):
+    claude_json = tmp_path / ".claude.json"
+
+    claude_json.write_text(json.dumps({}))
+    assert c.discover_project_configs(claude_json) == []
+
+    claude_json.write_text(json.dumps({"projects": ["not", "a", "dict"]}))
+    assert c.discover_project_configs(claude_json) == []
+
+
+def test_malformed_claude_json_fails_quiet(fake_home):
+    (fake_home / ".claude.json").write_text("{not valid json")
+    assert c.discover_project_configs(fake_home / ".claude.json") == []
+    # discover_profiles as a whole must still work and just skip project profiles
+    profs = c.discover_profiles()
+    assert not any(p.label.startswith("Project:") for p in profs)
+
+
+def test_project_configs_deduped_against_existing_profiles(fake_home):
+    # Point a project directly at the Claude Code profile's own .mcp.json-shaped
+    # path to prove discover_profiles() won't duplicate an already-listed path.
+    proj = fake_home / "dup-project"
+    proj.mkdir()
+    mcp_path = proj / ".mcp.json"
+    mcp_path.write_text('{"mcpServers": {"x": {"command": "npx"}}}')
+    (fake_home / ".claude.json").write_text(json.dumps({"projects": {str(proj): {}}}))
+
+    direct = c.discover_project_configs(fake_home / ".claude.json")
+    assert len(direct) == 1
+
+    profs = c.discover_profiles()
+    project_profiles = [p for p in profs if str(p.path) == str(mcp_path)]
+    assert len(project_profiles) == 1
+
+
 # --------------------------------------------------------------------------- #
 # 2. Write pipeline: preserves other keys + order, only touches mcpServers
 # --------------------------------------------------------------------------- #