v0.7.0

[0.7.0] - 2026-09-18

Added

• Gemini engine. gemini joins claude, codex, and agy as a built-in
  engine. Any phase can run on the Gemini CLI via engines.*.name = 'gemini' or
  --engine gemini. Headless phases run with --approval-mode (plan when
  read-only, yolo when writing), --skip-trust so a fresh worktree is
  trusted, and --output-format stream-json so long phases stay watchable.
  Gemini has no reasoning-effort flag, so a configured effort is ignored for
  it.