fix(ingest): address review round 1 (reclaim queue + tests)

- Register the periodic stalled-job reclaim on a dedicated ingest-maintenance
  queue that every worker drains (any --tier), so reclaim still fires when the
  fast fleet is scaled to zero and only ocr workers run. procrastinate's
  periodic-defer dedup keeps it single-run across drainers.
- escalation: mark `unsupported`/`forced` reason labels as reserved (not raised).
- processor: note that options/progress_callback are intentionally not threaded
  through _parse_pdf_tier yet (symmetric with the inline path).
- tests: assert TieredEscalationStrategy backoff progression (4/8/16/…/300s);
  cover get_ingest_pending per-queue aggregation + the legacy job_counts
  fallback; add an external-path zero-page no-escalation case; use the canonical
  INGEST_QUEUE_FAST instead of the back-compat alias.

Deck #323.

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

nextcloud_mcp_server/vector/processor.py

@@ -147,6 +147,10 @@ async def _parse_pdf_tier(
         EscalateError,
     )
 
+    # options / progress_callback are not threaded here -- the indexing caller
+    # passes neither today, and the inline path (registry.process) omits them
+    # too. Forward them if a tier processor ever needs per-call tuning (e.g. OCR
+    # DPI); keeping the two paths symmetric until then.
     result = await registry.process_tier(content, content_type, filename, tier)
     if result.success:
         decision = registry.evaluate_escalation(