v0.3.1

What's Changed

• fix: Harden public entry-point contracts by @mhiro2 in #32
• feat(health,config): Expand :checkhealth and fill config validation gaps by @mhiro2 in #33
• Refactor: Modularize persist, stack, and UI keymap layers by @mhiro2 in #35
• patch: Document persist privacy and surface copy-mode viewport truncation by @mhiro2 in #36

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