v0.2.13

Added

• Added context-pack measure, a read-only proof command that previews selected areas, scope reduction, and approximate text budget without writing a generated pack.
• Added measure to the quickstart, README terminal demo, Korean README, Codex skill guidance, and packaged plugin metadata.

Verification

• Local: 48 unit tests passed, packaged CLI smoke passed, npm dry-run passed, Python build passed, twine check passed.
• CI: main and v0.2.13 tag workflows passed on Windows/Ubuntu with Python 3.11/3.12.