0.34.0

CEGIS finds functions and says which counterexamples decide; branch and
bound takes your incumbent and runs twice as fast; options tested in
combination. No new commands (62) and no new kinds (65); the schema stays
5. New optional field: decisive (cegis_none).

New

• Templates in synth (certo.templates: polynomial, combination):
  the found object is a function, named in the result, optimised and proved
  unbounded with --prove-candidate.
• Decisive counterexamples: a minimal set that forces "none" (or "nothing
  better"), checked by verify -- alone sufficient, none removable.
• mixed --prove-optimal --incumbent FILE and --progress, and the same
  through certo.api.run("mixed", spec, prove_optimal=True, ...).
• DivisibilitySpec for solve: the incidence matrix built for you, Q and
  Z, and the obstruction when Q says yes and Z says no.
• CERTO_WORKSPACE_EXTRA: extra directories the MCP server may read.
• Every option in combination is now tested: synth, cover, nonneg,
  step, covering, compose.

Faster

• A branch-and-bound node on the 1048-column packing: 0.92 s to 0.45 s.

Changed

• certo report writes to the user's data directory by default.

Fixed (0.33.1, never published on its own)

• synth --prove-candidate after an optimised synthesis (minimize /
  maximize) ended with KeyError: 'implementation': the synth_optimum
  certificate keeps the candidate in the half that found it. The CLI, the
  MCP tool and the verifier of the combined synth_proved certificate now
  read the candidate from either shape (cegis.implementation_of).