feat: smart update strategy

[Justineo]

Summary

• Introduced the smart-update planner (src/smart-update.ts) and wired it into ECharts.ts so reactive updates automatically choose between merge, replaceMerge, or full rebuild; manual updates and explicit update-options bypass the planner.
• Documented the strategy (English & Chinese README) directly under the option prop, explaining how manual mode and user-provided update-options behave
• Added AGENTS.md to outline contributor workflows for coding agents.
• Added Vitest infrastructure (pnpm test, config files) plus a tests/smart-update.test.ts suite covering signatures, planner heuristics, and real-world option transitions.
• Updated CI and release workflows to run pnpm test alongside lint/typecheck/build.

Smart update details

• We build a minimal signature (arrays, objects, scalars, options/media length) and compare it to the previous one.
• Deletions of objects → inject null; deletions of arrays → inject [] and add replaceMerge.
• ID or anonymous-item removal → replaceMerge; scalar removal or shrinking options/media → notMerge: true.
• Manual setOption and explicit update-options bypass the planner.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
vue-echarts	Ready	Preview	Comment	Sep 17, 2025 4:23pm