v0.6.0

• Fixup mode: --fixup folds dirty changes into the unpushed commits that
  introduced them, autosquash under the hood, conflict-safe with abort and
  restore.
• --yes skips the approval prompt for scripted and headless runs.
• Eval harness: hack/eval.sh runs the skill headless against fixture repos
  and asserts on git state, style conformance, and the merge and scope guards.
• Limitations section in the README.