fix(ingestion): materialize scanner generator before inline processing

The folder scanner commits each document's row inside a per-document
session_scope that only finalizes when the generator advances past its
yield. In inline mode scripts/ingest_folder.py invoked the pipeline
(which opens a fresh session) before that commit landed, so
process_document_id saw "document_missing" and the pipeline aborted at
STORED_ORIGINAL.

Draining the generator with list() forces every scanner commit before
any pipeline run. Verified end to end: a generated PDF now progresses
DISCOVERED -> ... -> CHUNKING_COMPLETED and is searchable.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/ingest_folder.py

@@ -28,7 +28,14 @@ def main(path: Path, recursive: bool, force: bool, mode: str) -> None:
     run_id = uuid.uuid4()
     discovered = queued = dups = invalid = 0
 
-    for record in discover_documents(path, recursive=recursive, force=force):
+    # Materialize generator first: scanner's per-document session_scope only
+    # commits when the generator advances past the yield. Inline mode invokes
+    # the pipeline (which opens a fresh session) before that commit happens,
+    # so the document row is invisible. List() drains the generator end to end,
+    # forcing all commits before any processing.
+    records = list(discover_documents(path, recursive=recursive, force=force))
+
+    for record in records:
         discovered += 1
         if record.duplicate and not force:
             dups += 1