feat(severity): add trivial + info levels

pilot/ai_review.py

@@ -68,10 +68,11 @@ _SHA_MARKER_RE = re.compile(r"<!-- pragent:sha=([0-9a-f]{7,40}) -->")
 AI_REVIEW_LABEL = "AI-REVIEW"
 # Opt-in label for the token-usage block. Read at render time — see pr_has_label.
 AI_USAGE_LABEL = "AI-USAGE"
-SEVERITIES = ("critical", "high", "medium", "low")
+SEVERITIES = ("critical", "high", "medium", "low", "trivial", "info")
 # Severity rank — higher = more severe. Used by `apply_repo_config` to drop
-# findings below `severity_threshold`. Critical=3, high=2, medium=1, low=0.
-SEVERITY_RANK = {"low": 0, "medium": 1, "high": 2, "critical": 3}
+# findings below `severity_threshold`. critical=4, high=3, medium=2, low=1,
+# trivial=0, info=-1.
+SEVERITY_RANK = {"info": -1, "trivial": 0, "low": 1, "medium": 2, "high": 3, "critical": 4}
 REPO_CONFIG_FILE = ".pr-review.json"
 
 # Style → (default max_findings, default severity_threshold). Strict is
@@ -957,6 +958,7 @@ _SEVERITY_EMOJI = {
     "high": "🔴",
     "medium": "🟡",
     "low": "🔵",
+    "trivial": "⚪",
     "info": "⚪",
     "nit": "⚪",
 }