test(vet): add negative case for anonymous-parameter rule

Companion to vet_anonymous_params: every parameter is named (inferred,
sqlc.arg(), and @param), so the no-anonymous-params rule must emit no
violations. Guards against false positives / a regression in
Parameter.name population.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: JasonDav

internal/endtoend/testdata/vet_anonymous_params_pass/exec.json

@@ -0,0 +1,3 @@
+{
+  "command": "vet"
+}

internal/endtoend/testdata/vet_anonymous_params_pass/query.sql

@@ -0,0 +1,11 @@
+-- name: GetByInferredName :one
+SELECT id FROM bar
+WHERE id = $1;
+
+-- name: GetByArg :one
+SELECT id FROM bar
+WHERE id = sqlc.arg(target_id);
+
+-- name: GetByAtParam :one
+SELECT id FROM bar
+WHERE id = @min_id;

internal/endtoend/testdata/vet_anonymous_params_pass/schema.sql

@@ -0,0 +1 @@
+CREATE TABLE bar (id bigserial NOT NULL);

internal/endtoend/testdata/vet_anonymous_params_pass/sqlc.yaml

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+version: 2
+sql:
+  - schema: "schema.sql"
+    queries: "query.sql"
+    engine: "postgresql"
+    gen:
+      go:
+        package: "querytest"
+        out: "db"
+    rules:
+      - no-anonymous-params
+rules:
+  - name: no-anonymous-params
+    message: "query has an anonymous parameter; name it with sqlc.arg() or @name"
+    rule: |
+      query.params.exists(p, p.name == "")