style: apply ruff lint fixes and formatting to figment modules

Fixes: unused imports, import sorting, unused variable, overly broad
exception type in test.

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

tests/test_figment.py

@@ -2,17 +2,11 @@
 
 import os
 from enum import Enum
-from unittest.mock import patch
-
-import pytest
 
 from effects_plugins.figment import FigmentEffect, FigmentPhase, FigmentState
 from engine.effects.types import EffectConfig, EffectContext
 
-
-FIXTURE_SVG = os.path.join(
-    os.path.dirname(__file__), "fixtures", "test.svg"
-)
+FIXTURE_SVG = os.path.join(os.path.dirname(__file__), "fixtures", "test.svg")
 FIGMENTS_DIR = os.path.join(os.path.dirname(__file__), "fixtures")
 
 
@@ -104,12 +98,10 @@ class TestFigmentStateMachine:
         assert state.phase == FigmentPhase.REVEAL
 
         # Advance enough frames to get through all phases
-        last_state = None
         for frame in range(2, 100):
             state = effect.get_figment_state(frame, 40, 20)
             if state is None:
                 break
-            last_state = state
 
         # Should have completed the full cycle back to idle
         assert state is None

tests/test_figment_render.py

@@ -31,7 +31,8 @@ class TestRasterizeSvg:
 
     def test_nonexistent_file_raises(self):
         import pytest
-        with pytest.raises(Exception):
+
+        with pytest.raises((FileNotFoundError, OSError)):
             rasterize_svg("/nonexistent/file.svg", 40, 20)