fix: resolve CI failures — lint, import guards, and test fixtures

- Remove unused imports (os, pytest) in test_rust_bridge.py
- Add pytest.importorskip for fastapi/starlette in test_learning_api.py
- Fix AppleEnergyMonitor test fixtures: set _zeus_ok, _chip_name,
  _tdp_watts attributes when using __new__ to skip __init__
- Fix uninitialized monitor test to match CPU-time fallback behavior

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/telemetry/test_energy_apple.py

@@ -65,6 +65,7 @@ class TestEnergyMethod:
         from openjarvis.telemetry.energy_apple import AppleEnergyMonitor
 
         monitor = AppleEnergyMonitor.__new__(AppleEnergyMonitor)
+        monitor._zeus_ok = True
         assert monitor.energy_method() == "zeus"
 
 
@@ -91,7 +92,8 @@ class TestSampleComponentBreakdown:
         monitor = AppleEnergyMonitor.__new__(AppleEnergyMonitor)
         monitor._poll_interval_ms = 50
         monitor._monitor = mock_zeus_monitor
-        monitor._initialized = True
+        monitor._zeus_ok = True
+        monitor._chip_name = "M1"
 
         with monitor.sample() as result:
             time.sleep(0.01)
@@ -123,7 +125,8 @@ class TestSampleComponentBreakdown:
         monitor = AppleEnergyMonitor.__new__(AppleEnergyMonitor)
         monitor._poll_interval_ms = 50
         monitor._monitor = mock_zeus_monitor
-        monitor._initialized = True
+        monitor._zeus_ok = True
+        monitor._chip_name = "M1"
 
         with monitor.sample() as result:
             pass
@@ -145,15 +148,19 @@ class TestSampleUninitialized:
         monitor = AppleEnergyMonitor.__new__(AppleEnergyMonitor)
         monitor._poll_interval_ms = 50
         monitor._monitor = None
-        monitor._initialized = False
+        monitor._zeus_ok = False
+        monitor._chip_name = "Apple Silicon"
+        monitor._tdp_watts = 20.0
 
         with monitor.sample() as result:
             pass
 
-        assert result.energy_joules == 0.0
-        assert result.cpu_energy_joules == 0.0
-        assert result.gpu_energy_joules == 0.0
-        assert result.dram_energy_joules == 0.0
-        assert result.ane_energy_joules == 0.0
+        # CPU-time fallback produces small but non-zero estimates
+        assert result.energy_joules >= 0.0
+        assert result.cpu_energy_joules >= 0.0
+        assert result.gpu_energy_joules >= 0.0
+        assert result.dram_energy_joules >= 0.0
+        assert result.ane_energy_joules >= 0.0
         assert result.duration_seconds >= 0
         assert result.vendor == "apple"
+        assert result.energy_method == "cpu_time_estimate"