120 reject square bracket phantom

// PIN: phantom state in a type position must use ANGLE brackets `<state>`.
// The square-bracket form `[state!]` must be a hard parse error — NOT silently
// swallowed into the type string with phantom=null (which gives zero obligation
// checking and false safety). See AST: `*Resource[active!]` → type stays
// "*Resource[active!]", phantom=null; `*Resource<active!>` → type "*Resource",
// phantom="active!".
~tor use-sq { r: *Resource[active!] }
~proc use-sq|zig { _ = r; }