fix: remove unused imports from cache-ruleset.py, detect-binexport2-capabilities.py, show-capabilities-by-function.py

Removes capa.engine, capa.helpers, capa.features, and capa.features.insn
imports that were never referenced in each script. Adds missing capa.loader
import to show-capabilities-by-function.py which was already being used.

CHANGELOG.md

@@ -49,6 +49,7 @@
 - fix: Scopes.from_dict uses cls instead of self so subclasses return the correct type @williballenthin
 - fix: correct wrong dict key in VMRay _compute_monitor_threads assertion (used thread_id instead of process_id) @williballenthin
 - fix: replace assert with isinstance guard in get_callee for invalid MethodSpec tokens @williballenthin
+- fix: remove unused imports of capa.engine, capa.helpers, and capa.features from cache-ruleset.py, detect-binexport2-capabilities.py, and show-capabilities-by-function.py @williballenthin (SURF-92)
 - fix: remove dead except ValueError clause in capa2sarif.py so JSONDecodeError is caught by the specific handler @williballenthin (SURF-91)
 - fix: dedent bulk-process.py main() body so explicit argv argument is used instead of silently ignored @williballenthin (SURF-90)
 - fix: guard statistics.quantiles/mean in compare-backends.py report() against empty duration lists @williballenthin (SURF-89)

scripts/cache-ruleset.py

@@ -29,10 +29,7 @@ from pathlib import Path
 
 import capa.main
 import capa.rules
-import capa.engine
-import capa.helpers
 import capa.rules.cache
-import capa.features.insn
 
 logger = logging.getLogger("cache-ruleset")
 

scripts/detect-binexport2-capabilities.py

@@ -39,10 +39,7 @@ import argparse
 
 import capa.main
 import capa.rules
-import capa.engine
 import capa.loader
-import capa.helpers
-import capa.features
 import capa.exceptions
 import capa.render.proto
 import capa.render.verbose

scripts/show-capabilities-by-function.py

@@ -64,9 +64,7 @@ import colorama
 
 import capa.main
 import capa.rules
-import capa.engine
-import capa.helpers
-import capa.features
+import capa.loader
 import capa.exceptions
 import capa.render.utils as rutils
 import capa.render.verbose