Add retry logic and stricter version detection for weak search results

Retries with a refined query when no version number appears alongside
release context words (latest/stable/released/current) in snippets.
Exposes retried flag in response and history.

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

main.py

@@ -1,6 +1,7 @@
 import json
 import logging
 import os
+import re
 from datetime import datetime, timezone
 from pathlib import Path
 
@@ -8,6 +9,9 @@ import httpx
 from fastapi import FastAPI, HTTPException
 from pydantic import BaseModel
 
+VERSION_PATTERN = re.compile(r'\bv?\d+\.\d+[\.\d]*\b')
+VERSION_CONTEXT = re.compile(r'\b(latest|stable|current|released?|new version)\b', re.IGNORECASE)
+
 logging.basicConfig(level=logging.INFO, format="%(asctime)s [sam] %(message)s")
 logger = logging.getLogger("sam")
 
@@ -51,6 +55,28 @@ async def search_web(query: str, max_results: int) -> list[dict]:
     ]
 
 
+def _has_version(results: list[dict]) -> bool:
+    for r in results:
+        text = r.get("snippet", "") + " " + r.get("title", "")
+        if VERSION_PATTERN.search(text) and VERSION_CONTEXT.search(text):
+            return True
+    return False
+
+
+async def search_with_retry(query: str, max_results: int) -> tuple[list[dict], bool]:
+    """Search SearXNG, retrying with a refined query if no version number found in results.
+    Returns (results, retried)."""
+    results = await search_web(query, max_results)
+    if _has_version(results):
+        return results, False
+    retry_query = query + " latest release version changelog"
+    logger.info(f"no version found in results — retrying: '{retry_query}'")
+    retry_results = await search_web(retry_query, max_results)
+    seen_urls = {r["url"] for r in results}
+    merged = results + [r for r in retry_results if r["url"] not in seen_urls]
+    return merged[:max_results], True
+
+
 async def ollama_synthesize(prompt: str, model: str) -> str:
     payload = {
         "model": model,
@@ -163,11 +189,11 @@ async def research(req: ResearchRequest):
     logger.info(f"research: query='{req.query}' max_results={req.max_results} model={model}")
 
     try:
-        results = await search_web(req.query, req.max_results)
+        results, retried = await search_with_retry(req.query, req.max_results)
     except httpx.HTTPError as e:
         raise HTTPException(status_code=502, detail=f"SearXNG error: {e}")
 
-    logger.info(f"got {len(results)} results from SearXNG")
+    logger.info(f"got {len(results)} results from SearXNG (retried={retried})")
 
     prompt = build_prompt(req.query, results, req.instructions)
 
@@ -195,6 +221,7 @@ async def research(req: ResearchRequest):
         "query": req.query,
         "model": model,
         "summary_chars": len(summary),
+        "retried": retried,
     }
     save_history(history_entry)
     (out_dir / "index.html").write_text(render_html(load_history()))
@@ -214,4 +241,5 @@ async def research(req: ResearchRequest):
         "summary": summary,
         "model": model,
         "timestamp": timestamp,
+        "retried": retried,
     }