fix: WAL mode for concurrent reads, skipped stats, anti-repetition prompts

database.py: enable PRAGMA journal_mode=WAL + synchronous=NORMAL so
  /status reads from concurrent connections see committed data without
  blocking behind the scraper's writes; add 'skipped' to get_session_stats

bot.py: show skipped count in fmt_progress and cmd_status; use 'or 0'
  to guard against NULL from SUM(); label active research in /status

processor.py: raise generate() temperature default to 0.7 + add
  repeat_penalty=1.15/repeat_last_n=128 to Ollama options to stop
  qwen2.5:3b from looping; scoring prompt keeps temperature=0.1

generator.py: rewrite all prompts with explicit "NEVER repeat"
  constraints and distinct-content rules per section; podcast prompt
  now asks for spoken-word style (no formal headers); reduce thread
  to 12-18 tweets (was 15-25) to fit model context; pass temperature=0.7

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

src/processor/processor.py

@@ -25,12 +25,17 @@ class OllamaClient:
         self.model = settings.ollama_model
 
     async def generate(self, prompt: str, system: str = None,
-                       timeout: int = 120) -> str:
+                       timeout: int = 120, temperature: float = 0.7) -> str:
         payload = {
             "model": self.model,
             "prompt": prompt,
             "stream": False,
-            "options": {"temperature": 0.1, "num_predict": 512}
+            "options": {
+                "temperature": temperature,
+                "num_predict": 2048,
+                "repeat_penalty": 1.15,
+                "repeat_last_n": 128,
+            }
         }
         if system:
             payload["system"] = system
@@ -219,7 +224,7 @@ class ContentProcessor:
             f"Reply with ONLY a single integer 0-10. No explanation."
         )
         try:
-            response = await self.ollama.generate(prompt)
+            response = await self.ollama.generate(prompt, temperature=0.1)
             numbers = re.findall(r'\b(\d+(?:\.\d+)?)\b', response)
             if numbers:
                 score = float(numbers[0])