Agentflow v0.3.1

What's Changed

• feat: M5 post-release acceptance and published CLI documentation by @howlil in #15
• feat: M6 cross-agent compatibility and five-host lifecycle acceptance by @howlil in #16
• feat: M7 distribution onboarding and canonical discovery index by @howlil in #17
• feat: M8 supply chain hardening and opt-in npm Trusted Publishing by @howlil in #18
• fix: validate true skill rollback and current cross-agent candidate by @howlil in #22
• fix(cli): shell-free Windows npx launch and verified router setup by @howlil in #23
• release: request v0.3.1 by @howlil in #24

Full Changelog: v0.3.0...v0.3.1