v1.1.0

Added

• Cross-agent distribution. AGENTS.md is the canonical guidance, read automatically
  by Cursor, GitHub Copilot agent mode, Codex, Continue, Aider, Windsurf, and others.
  Thin per-tool pointer rules sit alongside it: .cursor/rules/no-em-dashes.mdc,
  .github/copilot-instructions.md, and .windsurf/rules/no-em-dashes.md.
• Two long-form evals (a 1000-word essay and a 1000-word landing page) and
  skills/no-em-dashes/evals/results/em_dash_counts.csv, recording em dash counts per
  eval with the skill versus without it.
• A hero image in the README.
• Guidance-sync documentation in MAINTAINING.md and CONTRIBUTING.md, explaining why
  SKILL.md and AGENTS.md mirror the same rule and how to keep them aligned.
• This CHANGELOG.md and a GitHub Actions CI workflow (unit tests across Python 3.9,
  3.11, and 3.13, plus an em-dash dogfood check over the repo's own prose).