feat(interpreter): implement glob options (dotglob, nocaseglob, failglob, noglob, globstar)

[chaliy]

Summary

• Enforces shopt glob options during glob expansion: dotglob, nocaseglob, failglob, noglob (set -f), globstar
• Adds case-insensitive matching to glob_match and match_bracket_expr
• Gates ** recursive glob on shopt -s globstar (bash-compatible behavior)
• Refactors three glob expansion call sites into shared expand_glob_item helper
• Adds 13 spec tests covering all glob options

Test plan

• All 1424 spec tests pass (1419 pass, 5 skip)
• cargo clippy clean
• cargo fmt clean
• Existing glob_recursive test updated to use shopt -s globstar