fix(ci): guard all test DB/file cleanup against Windows PermissionError

Wrap os.unlink() in try/except PermissionError in test_idle_evolution,
test_boot_sequence, and test_rag — same SQLite WAL lock issue on Windows CI.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: SwiftWing21

tests/test_boot_sequence.py

@@ -31,7 +31,10 @@ def test_sets_env_var_from_secrets(self):
             # (Only set if not already in env — clear first)
             os.environ.pop("TEST_SECRET_KEY", None)
         finally:
-            os.unlink(tmp)
+            try:
+                os.unlink(tmp)
+            except PermissionError:
+                pass
 
     def test_skips_comment_lines(self):
         from boot_sequence import _load_secrets

tests/test_idle_evolution.py

@@ -30,7 +30,10 @@ def tearDown(self):
         except Exception:
             pass
         os.environ.pop("FLEET_TEST_DB", None)
-        os.unlink(self.tmp.name)
+        try:
+            os.unlink(self.tmp.name)
+        except PermissionError:
+            pass
         import idle_evolution
         idle_evolution._staleness_cache.clear()
 
@@ -115,7 +118,10 @@ def tearDown(self):
         except Exception:
             pass
         os.environ.pop("FLEET_TEST_DB", None)
-        os.unlink(self.tmp.name)
+        try:
+            os.unlink(self.tmp.name)
+        except PermissionError:
+            pass
 
     def test_log_idle_run_inserts_row(self):
         from idle_evolution import log_idle_run
@@ -145,7 +151,10 @@ def tearDown(self):
         except Exception:
             pass
         os.environ.pop("FLEET_TEST_DB", None)
-        os.unlink(self.tmp.name)
+        try:
+            os.unlink(self.tmp.name)
+        except PermissionError:
+            pass
 
     def test_returns_list(self):
         from idle_evolution import get_idle_stats

tests/test_rag.py

@@ -235,7 +235,10 @@ def test_hash_is_hex_string(self):
             f.write(b"hello world")
             tmp = f.name
         result = _file_hash(Path(tmp))
-        os.unlink(tmp)
+        try:
+            os.unlink(tmp)
+        except PermissionError:
+            pass
         self.assertIsInstance(result, str)
         self.assertRegex(result, r"^[0-9a-f]+$")