feat: add the slackware card

The big value is the time since slackpkg's ChangeLog changed, coloured green
under a day, amber to a week, red past it.

A cache with no changelog key is a different failure from no cache at all:
the sampler ran and the ChangeLog is what was missing, so the rows still draw
and only the age reads '--'. Collapsing the two would send the reader to the
wrong problem.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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