v4.0.0

What's Changed

• fix(release): publish v3.0.0 directly by @CakeRepository in #15
• ci: enable npm trusted publishing by @CakeRepository in #16
• ci: clean up npm release workflows by @CakeRepository in #17
• chore: run one-time MCP v2 migration by @CakeRepository in #18
• chore: retry MCP v2 migration runner by @CakeRepository in #19
• feat: support MCP protocol 2026-07-28 by @CakeRepository in #20

Full Changelog: v3.0.0...v4.0.0