test: add end-to-end tests for accurate analyzer mode

Add three end-to-end test cases for the accurate analyzer mode:

1. accurate_star_expansion - Tests SELECT *, INSERT RETURNING *, UPDATE RETURNING *, DELETE RETURNING *
2. accurate_enum - Tests enum type introspection from pg_catalog
3. accurate_cte - Tests CTE (Common Table Expression) with star expansion

All tests use the managed-db context which requires Docker to run
PostgreSQL containers.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: kyleconroy

internal/endtoend/testdata/accurate_cte/postgresql/stdlib/exec.json

@@ -0,0 +1,3 @@
+{
+  "contexts": ["managed-db"]
+}

internal/endtoend/testdata/accurate_cte/postgresql/stdlib/go/db.go

@@ -0,0 +1,11 @@
+-- name: ListExpensiveProducts :many
+WITH expensive AS (
+    SELECT * FROM products WHERE price > 100
+)
+SELECT * FROM expensive;
+
+-- name: GetProductStats :one
+WITH product_stats AS (
+    SELECT COUNT(*) as total, AVG(price) as avg_price FROM products
+)
+SELECT * FROM product_stats;

internal/endtoend/testdata/accurate_cte/postgresql/stdlib/go/models.go

@@ -0,0 +1,5 @@
+CREATE TABLE products (
+    id SERIAL PRIMARY KEY,
+    name TEXT NOT NULL,
+    price NUMERIC(10,2) NOT NULL
+);

internal/endtoend/testdata/accurate_cte/postgresql/stdlib/go/query.sql.go

@@ -0,0 +1,11 @@
+version: "2"
+sql:
+  - engine: postgresql
+    schema: "schema.sql"
+    queries: "query.sql"
+    analyzer:
+      accurate: true
+    gen:
+      go:
+        package: "querytest"
+        out: "go"

internal/endtoend/testdata/accurate_cte/postgresql/stdlib/query.sql

@@ -0,0 +1,3 @@
+{
+  "contexts": ["managed-db"]
+}