feat(ledger): CSS derive families are names, never bodies — name floor 2 for css, dup: grouping sym-only; derive line says "repeated name" and dismisses scoped-css; plugin 0.1.41 (note #2917)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/scribe/services/plugin_context.py

@@ -1061,17 +1061,27 @@ def _derive_line(path: str, derive: list[dict]) -> str:
             )
             continue
         f = d["family"]
-        how = "identical body" if f.get("identical") else "same name defined"
         files = ", ".join(f"`{x}`" for x in f.get("files") or [])
         more = f.get("file_count", 0) - len(f.get("files") or [])
         if more > 0:
             files += f" +{more} more"
+        n = f.get("file_count", 0)
+        if f.get("identical"):
+            what = f"is a duplicate family with no canon — identical body in {n} other file(s)"
+        else:
+            # A name family: the same definition name living in several
+            # files. CSS is only ever grouped this way (note 2917) — a class
+            # is a recipe, and the recipe is what gets derived or dismissed.
+            what = f"is a repeated name with no canon — defined in {n} other file(s)"
+        # The dismissal reason the family most likely earns: a class name
+        # reused for different purposes is scoped styling; a code name reused
+        # across modules is convention plumbing.
+        dismiss = "scoped-css" if d.get("kind") == "css" else "convention-plumbing"
         parts.append(
-            f"`{f['label']}` is a duplicate family with no canon — {how} in "
-            f"{f.get('file_count', 0)} other file(s): {files}; derive it now: "
+            f"`{f['label']}` {what}: {files}; derive it now: "
             "record the canon (create_snippet) and make the copies instances "
             "(classify_shapes) — or, if these are convention not copies, "
-            "`classify_shapes(..., status=\"exempt\", reason_code=\"convention-plumbing\")` "
+            f"`classify_shapes(..., status=\"exempt\", reason_code=\"{dismiss}\")` "
             "dismisses the family — rather than adding another copy"
         )
     return f"> Shape ledger at `{path}`: " + "; ".join(parts) + "."