fix(snippets): satisfy the parity guards the drift check tripped

Two CI failures, both the guards working as intended rather than defects
in them:

- The MCP tool-name manifest and the REST route/service parity lists are
  explicit, so a new capability has to be added to both surfaces or the
  test fails. verify_snippet / verify_snippet_route / record_verification
  added, plus an assertion that the `verification` filter reaches both
  callers — a verdict an agent records must be visible to the human
  looking at the same corpus, or the two surfaces disagree about what's
  rotten (rule #33).

- vue-tsc rejected two object-literal lookups keyed by the status union:
  `status` includes "ok" and "unverified", and an object literal has to
  enumerate every member even just to say "nothing to show for these".
  Typed as Record<string, string>, which is what the ?? "" fallback
  already assumed.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UaYUaouG9jjhATyuxCKrQs

frontend/src/views/SnippetListView.vue

@@ -161,9 +161,15 @@ function driftBadge(s: SnippetListItem): string {
   const v = s.verification;
   if (!v) return "";
   if (!v.current) return "unchecked since edit";
-  return { ok: "", missing: "path gone", moved: "symbol moved", changed: "code drifted" }[
-    v.status
-  ] ?? "";
+  // Record<string, string>, not an object literal: `status` is a union that
+  // includes "ok" and "unverified", and a literal would have to enumerate every
+  // member just to say "nothing to show for these".
+  const labels: Record<string, string> = {
+    missing: "path gone",
+    moved: "symbol moved",
+    changed: "code drifted",
+  };
+  return labels[v.status] ?? "";
 }
 
 function driftTitle(s: SnippetListItem): string {
@@ -178,12 +184,12 @@ function driftTitle(s: SnippetListItem): string {
       `code this record no longer holds. Re-verify it.`
     );
   }
-  const what =
-    {
-      missing: "the recorded path no longer exists",
-      moved: "the file is there but the symbol isn't in it",
-      changed: "the source no longer matches the recorded code",
-    }[v.status] ?? "";
+  const reasons: Record<string, string> = {
+    missing: "the recorded path no longer exists",
+    moved: "the file is there but the symbol isn't in it",
+    changed: "the source no longer matches the recorded code",
+  };
+  const what = reasons[v.status] ?? "";
   return v.detail ? `${when}: ${what}. ${v.detail}` : `${when}: ${what}.`;
 }