feat: make perception_cache confidence threshold configurable

Move hardcoded 0.85 threshold from perception_cache.py to config.py
as perception_confidence_threshold setting with default 0.85.

Fixes #1259

src/config.py

@@ -455,6 +455,10 @@ class Settings(BaseSettings):
     # Background meditation interval in seconds (0 = disabled).
     scripture_meditation_interval: int = 0
 
+    # ── Perception Cache ───────────────────────────────────────────────
+    # Minimum confidence threshold for template matching in perception cache.
+    perception_confidence_threshold: float = 0.85
+
     def _compute_repo_root(self) -> str:
         """Auto-detect repo root if not set."""
         if self.repo_root:

src/timmy/sovereignty/perception_cache.py

@@ -8,6 +8,8 @@ from typing import Any
 import cv2
 import numpy as np
 
+from config import settings
+
 
 @dataclass
 class Template:
@@ -43,7 +45,7 @@ class PerceptionCache:
                 best_match_confidence = max_val
                 best_match_name = template.name
 
-        if best_match_confidence > 0.85:  # TODO: Make this configurable per template
+        if best_match_confidence > settings.perception_confidence_threshold:
             return CacheResult(
                 confidence=best_match_confidence, state={"template_name": best_match_name}
             )