Add an optional `analyzer.accurate: true` mode for PostgreSQL that bypasses
the internal catalog and uses only database-backed analysis.
Key features:
- Uses database PREPARE for all type resolution (columns, parameters)
- Uses expander package for SELECT * and RETURNING * expansion
- Queries pg_catalog to build catalog structures for code generation
- Skips internal catalog building from schema files
Configuration:
```yaml
sql:
 - engine: postgresql
 database:
 uri: "postgres://..." # or managed: true
 analyzer:
 accurate: true
```
This mode requires a database connection and the schema must exist in the
database. It provides more accurate type information for complex queries.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>

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>

Update expected output files to match actual sqlc generate output:
- Fix parameter naming (Column1, Column2, dollar_1)
- Fix nullability types (sql.NullString, sql.NullInt32)
- Fix CTE formatting (single line)
- Fix query semicolons
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>

Tests CTE using VALUES clause with column aliasing to verify
accurate analyzer handles inline table expressions.
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Co-Authored-By: Claude <noreply@anthropic.com>

The VALUES clause was incorrectly formatting multiple rows as a single
row with multiple columns. For example:
 VALUES ('A'), ('B'), ('C')
was being formatted as:
 VALUES ('A', 'B', 'C')
This caused the star expander to think the VALUES table had 3 columns
instead of 1, resulting in incorrect SELECT * expansion.
The fix properly iterates over each row in ValuesLists and wraps each
in parentheses.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>