v1.0.0-alpha

What's Changed

• docs: design note for lambda-free exception boundaries (rescue) by @CodeHalwell in #219
• Alpha prep (v1.0-alpha): type-system frontier, third-party checking depth, formatter/diagnostics fixes, perf gate + tooling by @CodeHalwell in #220
• docs(skill,frontier): sync installed skill + refresh frontier status for alpha by @CodeHalwell in #223

Full Changelog: v0.15.7...v1.0.0-alpha