v0.3: SQLite persistence + ProjectService + dependency resolution

- New: services/sensu_db.py (SQLite, 5 tables)
- New: services/project_service.py (project registry, port allocation, dep resolution)
- Integrated into main.py (step 11.6)
- Tests: 23/23 passing (15 original + 8 new)

tests/test_v03.py

@@ -0,0 +1,75 @@
+"""v0.3 tests: SQLite DB, ProjectService, Dependency Resolution"""
+import pytest, os, sys, asyncio
+sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))
+
+class TestSenSuDB:
+    @pytest.fixture
+    def db(self):
+        from services.sensu_db import SenSuDB
+        import tempfile
+        d = SenSuDB(":memory:")
+        yield d
+        d.close()
+
+    def test_save_and_get_plugin(self, db):
+        db.save_plugin("test_plugin", version="1.0", status="running")
+        p = db.get_plugin("test_plugin")
+        assert p["name"] == "test_plugin"
+        assert p["version"] == "1.0"
+        assert p["status"] == "running"
+
+    def test_list_plugins(self, db):
+        db.save_plugin("p1", version="1.0")
+        db.save_plugin("p2", version="2.0")
+        lst = db.list_plugins()
+        assert len(lst) >= 2
+
+    def test_permissions(self, db):
+        db.grant_permission("p1", "read")
+        assert db.check_permission("p1", "read") is True
+        assert db.check_permission("p1", "write") is False
+
+    def test_config_kv(self, db):
+        db.set_config("theme", "dark")
+        assert db.get_config("theme") == "dark"
+        assert db.get_config("nonexistent", "default") == "default"
+
+class TestProjectService:
+    def test_register_project(self):
+        from services.project_service import ProjectService
+        ps = ProjectService(None)
+        ok = ps.register_project("test_plugin", {"name": "TestProject", "port": 5000, "path": "/tmp/test"})
+        assert ok is True
+        p = ps.get_project("TestProject")
+        assert p["port"] == 5000
+        assert p["status"] == "registered"
+
+    def test_port_conflict(self):
+        from services.project_service import ProjectService
+        ps = ProjectService(None)
+        ps.register_project("p1", {"name": "A", "port": 5000})
+        ps.register_project("p2", {"name": "B", "port": 5000})
+        b = ps.get_project("B")
+        assert b["port"] != 5000  # should get a different port
+
+    def test_dependency_resolution(self):
+        from services.project_service import ProjectService
+        ps = ProjectService(None)
+        plugins = {
+            "base": {"depends_on": []},
+            "middle": {"depends_on": ["base"]},
+            "top": {"depends_on": ["middle"]},
+        }
+        order = ps.resolve_dependencies(plugins)
+        assert order.index("base") < order.index("middle")
+        assert order.index("middle") < order.index("top")
+
+    def test_circular_dependency(self):
+        from services.project_service import ProjectService
+        ps = ProjectService(None)
+        plugins = {
+            "a": {"depends_on": ["b"]},
+            "b": {"depends_on": ["a"]},
+        }
+        order = ps.resolve_dependencies(plugins)
+        assert len(order) == 2  # should handle gracefully