Put every S3 URI in one place, and add a lint gate

Five workers built output URIs with inline f-strings, so the bucket-per-artifact
layout was spread across worker_tts, worker_identity, worker_crop, worker_layers
and worker_render. Moving a class between buckets meant a grep. They are now
templates in transport.py, formatted at each call site.

Three of those workers also each reimplemented the same parse to recover
manga_id and chapter_id from an input uri, because the orchestrator does not
send them. That is transport.ids_from_uri now, and it raises on a uri too short
to carry the ids rather than returning a wrong pair.

ruff.toml makes `ruff check .` exit 0, so CI can gate on it and a new finding
means a new defect. Fixed: an implicit Optional in 8 signatures, an unparenthesized
implicit concatenation in the ASS filter list, 5 subprocess.run calls now saying
check=False out loud, an unused import, a duplicate exception handler and a
non-executable shebang. Every rule left off carries its reason in ruff.toml.

The ASYNC rules are off because ffmpeg on the event loop is real and already
recorded at caveats/audit-open.md#blocking-event-loop. It needs a refactor per
handler, not a lint fix.

Checked: transport, collage, bubble_detect, test_vision_parse, worker_crop,
worker_scene, worker_script, worker_identity, worker_tts, session_manager,
worker_vision and worker_render self-checks all pass. worker_layers still fails
on a missing legacy/qwen_layered_workflow.json, which predates this branch.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

worker_vision.py

@@ -123,8 +123,8 @@ def _set_of_mark(local_path: str, present: list):
     return marked, "\n" + "\n".join(parts) + "\n", {f["label"]: f["local_id"] or "unknown" for f in faces}
 
 
-_GENDER_SUFFIX = re.compile(r"\s*\((?:m|f|male|female|man|woman|unknown)\)\s*$", re.I)
-_ID_SHAPED = re.compile(r"^(?:person|char|face|p)[\s_-]*\d+$", re.I)
+_GENDER_SUFFIX = re.compile(r"\s*\((?:m|f|male|female|man|woman|unknown)\)\s*$", re.IGNORECASE)
+_ID_SHAPED = re.compile(r"^(?:person|char|face|p)[\s_-]*\d+$", re.IGNORECASE)
 
 
 def _present_keys(present: list) -> dict: