klms 0.2.3

Correctness

Korean KLMS pages no longer fail with UPSTREAM_SHAPE_CHANGED when listing
assignments or quizzes, or when reading grade and attendance reports. Report
and coursework headers, week labels, empty-page messages, and absolute or
relative dates are recognized in Korean as well as English. Compact grade
reports without the Percentage and Contribution columns also work.
Calendar events use the card heading as their title instead of the submission
button text, and read structural timestamps first, falling back to English or
Korean date text in Asia/Seoul. Deadlines that were previously left out of
klms today and klms upcoming now appear. Resource URLs keep their numeric
ID and drop action parameters. A visible date that cannot be parsed remains an
explicit error rather than being silently dropped.
Scripts, templates, and hidden text are ignored when checking for empty
pages, and grade and attendance reports require enough matching columns to
avoid picking an unrelated table. Thanks to @AidenGeunGeun for the fix.

Other text locales are not verified; an unrecognized dated event fails agenda
generation rather than being omitted.

No command grammar, JSON envelope version, dependency, or SQLite migration
changes.