Release 1.4.0

• chore: remove openspec integrations (b2e4baa)
• chore: upgrade dependencies and fix js-yaml 5 migration (1a48fec)
• Add shop management commands (#14) (7b6895f)
• Upgrade TypeScript to 7.0.2 (c0a9711)
• Upgrade Vite+ to 1.4.0 and Vitest to 5 (82dcd95)
• Upgrade deps and migrate tests to vite-plus/test (e1fa211)
• docs: rewrite agent instructions (4a18955)
• Simplify sample post and page JSON examples (8987636)
• Enhance Halo CLI skill docs with examples (05f334b)
• Add import-json examples for posts and pages (d6220c4)
• Add OPSX commands, OpenSpec skills and prompts (cda37bc)