Initial commit: Conflict Checker

Cross-discipline design-contradiction checker for construction drawing
sets. Standalone tool broken out from Iron_Bid; a pipeline stage may
later fold back into Iron_Bid.

Pipeline: PDF->images -> per-sheet assertion extraction -> deterministic
clustering by location -> per-cluster reasoning -> report.
Includes CLI (cli/run_check.py) and web UI (backend/main.py).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/pipeline/rfi.py

@@ -0,0 +1,46 @@
+"""
+rfi.py - Stage 11: RFI / QAQC comment generation (LLM, text-only).
+
+Drafts professional, evidence-based RFI / QAQC comments from the prioritized
+issue list. Uses TEXT_MODEL (defaults to MODEL). Returns [] on failure.
+"""
+
+from typing import Dict, List
+
+from backend import config
+from backend.pipeline._serialize import dumps
+from backend.pipeline._stage import call_stage, collect_list
+from backend.prompts import RFI_SYSTEM_PROMPT, RFI_USER_INSTRUCTION
+
+
+def _valid_rfi(r: Dict) -> Dict:
+    """Keep an RFI only if it has a question or title; coerce list fields."""
+    if not isinstance(r, dict):
+        return None
+    if not (r.get("question") or r.get("title")):
+        return None
+    return {
+        "rfi_id": r.get("rfi_id") or "",
+        "issue_id": r.get("issue_id") or "",
+        "title": (r.get("title") or "").strip(),
+        "question": (r.get("question") or "").strip(),
+        "background": (r.get("background") or "").strip(),
+        "sheets_referenced": r.get("sheets_referenced") or [],
+        "disciplines_to_respond": r.get("disciplines_to_respond") or [],
+        "suggested_response_needed": (r.get("suggested_response_needed") or "").strip(),
+        "priority": (r.get("priority") or "medium").strip().lower(),
+    }
+
+
+def generate_rfis(prioritized: List[Dict]) -> List[Dict]:
+    if not prioritized:
+        return []
+    parsed = call_stage(
+        RFI_SYSTEM_PROMPT,
+        RFI_USER_INSTRUCTION,
+        subs={"prioritized_issues": dumps(prioritized)},
+        max_tokens=config.RFI_MAX_TOKENS,
+    )
+    rfis = collect_list(parsed, "rfi_comments", _valid_rfi)
+    print(f"[RFI] drafted {len(rfis)} RFI/QAQC comment(s)")
+    return rfis