CI: add engine coverage & linting/style fixes

Add AI engine coverage reporting to CI (run tests with coverage, show in step summary, and upload artifact). Relax and align engine pre-commit package specifiers and update uv.lock. Increase ruff line-length and add per-file ignores; update Taskfile and pre-commit Taskfile to use engine ruff config. Add coverage entries to engine/.gitignore. Apply numerous non-functional Python style and formatting fixes across scripts and cucumber test steps (imports, f-strings, line breaks, noqa markers, single-line asserts) to satisfy linters—no behavioral changes intended.

scripts/translations/ai_translation_helper.py

@@ -52,7 +52,7 @@ class AITranslationHelper:
                 "target_languages": languages,
                 "max_entries_per_language": max_entries_per_language,
                 "instructions": {
-                    "format": "Translate each entry maintaining JSON structure and placeholder variables like {n}, {total}, {filename}",
+                    "format": "Translate each entry maintaining JSON structure and placeholder variables like {n}, {total}, {filename}",  # noqa: E501
                     "context": "This is for a PDF manipulation tool. Keep technical terms consistent.",
                     "placeholders": "Preserve all placeholders: {n}, {total}, {filename}, etc.",
                     "style": "Keep translations concise and user-friendly",

scripts/translations/auto_translate.py

@@ -10,9 +10,9 @@ import json
 import os
 import subprocess
 import sys
-from concurrent.futures import ThreadPoolExecutor
 import time
 import tomllib
+from concurrent.futures import ThreadPoolExecutor
 from pathlib import Path
 
 
@@ -152,7 +152,7 @@ def translate_batches(batch_files, language_code, api_key, timeout=600, model="g
         print(f"\n[{i}/{total}] Translating {batch_file}...")
 
         # Always pass API key since it's required
-        cmd = f'python3 scripts/translations/batch_translator.py "{batch_file}" --language {language_code} --api-key "{api_key}" --model {model}'
+        cmd = f'python3 scripts/translations/batch_translator.py "{batch_file}" --language {language_code} --api-key "{api_key}" --model {model}'  # noqa: E501
 
         try:
             result = subprocess.run(cmd, shell=True, capture_output=True, text=True, timeout=timeout)
@@ -223,7 +223,7 @@ def apply_translations(merged_file, language_code):
     """Apply merged translations to the language file."""
     print(f"\n📝 Applying translations to {language_code}...")
 
-    cmd = f"python3 scripts/translations/translation_merger.py {language_code} apply-translations --translations-file {merged_file}"
+    cmd = f"python3 scripts/translations/translation_merger.py {language_code} apply-translations --translations-file {merged_file}"  # noqa: E501
 
     if not run_command(cmd):
         print("✗ Failed to apply translations")
@@ -352,9 +352,7 @@ Examples:
             sys.exit(0)
 
         # Step 2: Translate all batches
-        translated_files = translate_batches(
-            batch_files, args.language, api_key, args.timeout, args.model, args.parallel
-        )
+        translated_files = translate_batches(batch_files, args.language, api_key, args.timeout, args.model, args.parallel)
         if translated_files is None:
             sys.exit(1)
 

scripts/translations/batch_translator.py

@@ -98,7 +98,7 @@ CRITICAL RULES - MUST FOLLOW EXACTLY:
    - Do not remove any part of the original meaning
    - Keep the same level of detail
 
-Return ONLY the translated JSON. No markdown, no explanations, just the JSON object."""
+Return ONLY the translated JSON. No markdown, no explanations, just the JSON object."""  # noqa: E501
 
     def _record_usage(self, response) -> None:
         """Accumulate token usage/cost and print a per-batch line."""

scripts/translations/translation_analyzer.py

@@ -46,10 +46,7 @@ class TranslationAnalyzer:
 
             # Convert lists to sets for faster lookup
             return {
-                lang: set(patterns)
-                for lang, data in ignore_data.items()
-                for patterns in [data.get("ignore", [])]
-                if patterns
+                lang: set(patterns) for lang, data in ignore_data.items() for patterns in [data.get("ignore", [])] if patterns
             }
         except Exception as e:
             print(f"Warning: Could not load ignore file {self.ignore_file}: {e}")
@@ -282,7 +279,7 @@ def main():
     print("\nBottom 5 Languages Needing Attention:")
     for result in sorted_by_completion[-5:]:
         print(
-            f"  {result['language']}: {result['completion_rate']:.1f}% ({result['missing_count']} missing, {result['untranslated_count']} untranslated)"
+            f"  {result['language']}: {result['completion_rate']:.1f}% ({result['missing_count']} missing, {result['untranslated_count']} untranslated)"  # noqa: E501
         )
 
 

scripts/translations/translation_merger.py

@@ -467,9 +467,7 @@ def main():
 
         # Extract translations from template format or simple dict
         if "translations" in translations_data:
-            translations = {
-                k: v["translated"] for k, v in translations_data["translations"].items() if v.get("translated")
-            }
+            translations = {k: v["translated"] for k, v in translations_data["translations"].items() if v.get("translated")}
         else:
             translations = translations_data