v0.55.0

• The SKILL.md budget is 6000 rather than 4000, and the reasoning is written where the rule lives:
  the ceiling is a visibility mechanism, not a quality cap. It exists because the file loads on
  every trigger for every user, so growth is a cost borne by someone else and should be deliberate.
  When something belongs in the always-loaded file it goes there and the number moves in the same
  change. Never cut something worth saying to fit a figure.