Verbose per-call LLM logging, raw request/response dumps, and end-of-log cost summary.

- [LLM] line per call: stage, model, prompt size, output size, cost, parsed item counts
- LLM_RAW_DUMP: full prompt/response JSON per call under outputs/<job>/llm_raw/
- Cost block at tail of job.log (per-stage, per-model, cached vs live)
- Agent mode: reset llm cost counters per job; review finalization now teed into job.log + dumps

backend/config.py

@@ -102,6 +102,14 @@ CLUSTER_MAX        = int(os.getenv("CLUSTER_MAX", "120"))
 LLM_CACHE     = os.getenv("LLM_CACHE", "false").strip().lower() in ("1", "true", "yes")
 LLM_CACHE_DIR = os.getenv("LLM_CACHE_DIR", os.path.join(_BASE_DIR, ".llm_cache"))
 
+# Verbose LLM observability. Per call, one line lands in the job log (model,
+# backend, prompt size, response size, parsed-item counts, per-call cost) and
+# the full request/response is dumped to <out_dir>/llm_raw/ (base64 image
+# payloads excluded; image count recorded instead) so missed or hallucinated
+# items can be traced back to exactly what the model saw and returned.
+LLM_VERBOSE  = os.getenv("LLM_VERBOSE",  "true").strip().lower() in ("1", "true", "yes")
+LLM_RAW_DUMP = os.getenv("LLM_RAW_DUMP", "true").strip().lower() in ("1", "true", "yes")
+
 # Parallelism (ThreadPoolExecutor workers)
 EXTRACT_CONCURRENCY = int(os.getenv("EXTRACT_CONCURRENCY", "4"))
 REASON_CONCURRENCY  = int(os.getenv("REASON_CONCURRENCY",  "4"))