v0.13.0

Theme: the floor is business logic only.

Changed

• The semantic floor drops the test index entirely. At the deepest budget level
  the ? tests section is absent — header, file landmarks, helper names, and
  test-to-business edges alike. Test file landmarks used to be unconditional floor
  content, so the tightest budgets paid for test orientation before business API.
• Test file landmarks are now individually restorable facts (test-files), ranked
  and admitted like any other optional fact above the floor. Admitting a suite/case
  label or a coverage edge also admits the landmark line it renders on, so a restored
  name never arrives without the file it belongs to.

Nothing changes for unlimited maps or for budgets that comfortably fit the index; the
difference appears only when a budget binds. On this repository the floor drops from
759 to 701 estimated tokens; corpora with hundreds of test files recover far more,
since the index is proportional to the test tree.

hologram stats reports the new test-files category alongside the existing ones —
the schema grows additively.