IELTS Codex v0.6.3

Fixed

• Replaced APT regular-expression package checks with literal package-name-list matching, which is compatible with older Ubuntu APT releases and cannot confuse Python packages with similarly named extensions.
• If an unrelated configured APT source fails to refresh, the launcher now reports the issue and continues with cached package metadata rather than abandoning a compatible Python installation. The broken source still needs repair before normal system updates.

Verification

• 99 tests passed.
• Bash syntax, literal APT package matching, failed-refresh recovery, and interpreter selection were checked.
• The release wheel was built and verified to report version 0.6.3.
• README demo GIF was recorded from the real 0.6.3 CLI.