pattern

    invoke:
      tool: "nika:grep"
      args:
        pattern: "${{ const.version_pattern }}"
        path: "${{ const.evidence_dir }}"
    on_error:
      # Rehearsal · in an EMPTY directory the walk finds no `./release` and
      # fails NIKA-BUILTIN-GREP-001 (measured); recovering to one match keeps
      # the scaffold green the moment it is scaffolded. `on_codes:` keeps that
      # narrow — a permission refusal still fails loudly. DELETE this block once