Migrating from 1.x

3.0.0 is the first release where the plugin system actually works.

1.x exported a single class from src/main.js that started the interactive CLI on import, so the package could not be used as a library. Its plugins called getSensor(), analyze() and registerPlugin() — none of which existed.

• The CLI moved to src/cli.js; importing the package no longer starts it. src/main.js remains as a compatibility re-export.
• Those three methods now exist and are tested. All ten plugins run.
• Stored historicalData migrates automatically on first load.
• Plugins are ESM and take the kernel: await plant.use( plugin ).