Hold every filament product to exactly one id, with no exceptions

filament_id is the plain mint of the product triple (filament_vendor,
filament_type, filament name), and nothing else feeds it. The tooling used to
accept any salt iteration of a preset's own triple, and its minting policy
stepped past ids that other products held in the tree or in the snapshot, so
which id a product got could depend on history. Every "salt split" in the tree
masked a redundant preset rather than a real need, and no shipped id is
salted, so salting goes entirely: no salt parameter, no id policy object, and
--generate no longer reads the snapshot.

--check now holds every declared and every inherited id to that one value and
lists each preset that misses it, variants under a wrong root included, instead
of folding them into the root's error. Two products whose triples mint one id
is reported as a collision naming both, and --generate refuses to write it;
the remedy is a rename so the triples differ. The Bambu catalog map generator
keys its rows by the same mint rather than by what the tree already ships.

No id changes: all 913 ids in the tree are already the mint of their triple,
so --generate is a no-op and the snapshot is untouched.

scripts/tests/test_setting_id.py

@@ -141,13 +141,10 @@ class SettingTree:
         return changed, errors, buf.getvalue()
 
     def run_filament_ids(self, vendors=None, dry_run=False):
-        """The OTHER half of --generate, against this tree's own (absent)
-        snapshot, so the id policy never consults the repo's real one."""
+        """The OTHER half of --generate."""
         buf = io.StringIO()
         with contextlib.redirect_stdout(buf):
-            changed, errors = afi.generate_filament_ids(
-                self.profiles, os.path.join(self.dir, "filament_id_snapshot.json"),
-                vendors, dry_run)
+            changed, errors = afi.generate_filament_ids(self.profiles, vendors, dry_run)
         return changed, errors, buf.getvalue()