no-mistakes(review): Fix report-only gate, dedupe list, correct fleet map

scripts/disk-gc-plan.py

@@ -61,7 +61,8 @@ def load_report_only_guests(contract_path: pathlib.Path) -> list[dict]:
 
 
 def _keys(entry: dict) -> set[str]:
-    """Guest/host identity keys for an exclusion entry."""
+    """Guest/host identity keys, shared by exclusions and scan entries so the two
+    sides of the gate can never key on different fields."""
     out: set[str] = set()
     for field in ("guest", "id", "vmid", "hostname", "name", "ip"):
         value = entry.get(field)
@@ -70,15 +71,6 @@ def _keys(entry: dict) -> set[str]:
     return out
 
 
-def _entry_keys(scan_entry: dict) -> set[str]:
-    out: set[str] = set()
-    for field in ("id", "guest", "vmid", "hostname", "name", "ip"):
-        value = scan_entry.get(field)
-        if value is not None and str(value).strip():
-            out.add(str(value).strip().lower())
-    return out
-
-
 def level_for(pct: float) -> str | None:
     if pct >= CRITICAL:
         return "CRITICAL"
@@ -99,7 +91,7 @@ def build_plan(scan: list[dict], report_only: list[dict]) -> list[dict]:
         level = level_for(float(pct))
         if level is None:
             continue  # GREEN: log only, no action
-        scan_keys = _entry_keys(entry)
+        scan_keys = _keys(entry)
         match = next((e for e, keys in excluded if keys & scan_keys), None)
         target = next(
             (entry.get(k) for k in ("id", "guest", "vmid", "hostname", "name", "ip")