Description

The current tool exits with a generic message on bad input or SQL errors. Users deserve clear, actionable error output that helps them fix the problem — with exit codes that scripts can rely on.

Acceptance Criteria

• Usage help is printed to stderr, not stdout
• Exit code 0: success
• Exit code 1: usage error (missing query argument)
• Exit code 2: CSV parse error (with row number)
• Exit code 3: SQL error (with the sqlite3 error message)
• --help / -h flag prints usage details
• --version / -V flag prints the binary version (injected at build time)
• All error messages are prefixed with error: and go to stderr

Notes

• Version can be injected via build.zig using exe.root_module.addAnonymousImport or -Dversion option
• std.process.exit codes should be documented in the README