refactor(tasks): remove manual PaperlessTask creation and scheduled/auto params

All task records are now created exclusively via Celery signals (Task 2).
Removed PaperlessTask creation/update from train_classifier, sanity_check,
llmindex_index, and check_sanity. Removed scheduled= and auto= parameters
from all 7 call sites. Updated apply_async callers to use trigger_source
headers instead. Exceptions now propagate naturally from task functions.

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

src/documents/management/commands/document_create_classifier.py

@@ -22,7 +22,6 @@ class Command(PaperlessCommand):
             self.buffered_logging("paperless.classifier"),
         ):
             train_classifier(
-                scheduled=False,
                 status_callback=lambda msg: self.console.print(f"  {msg}"),
             )
 

src/documents/management/commands/document_llmindex.py

@@ -17,7 +17,6 @@ class Command(PaperlessCommand):
     def handle(self, *args: Any, **options: Any) -> None:
         llmindex_index(
             rebuild=options["command"] == "rebuild",
-            scheduled=False,
             iter_wrapper=lambda docs: self.track(
                 docs,
                 description="Indexing documents...",

src/documents/management/commands/document_sanity_checker.py

@@ -111,7 +111,6 @@ class Command(PaperlessCommand):
 
     def handle(self, *args: Any, **options: Any) -> None:
         messages = check_sanity(
-            scheduled=False,
             iter_wrapper=lambda docs: self.track(
                 docs,
                 description="Checking documents...",