Manage Vercel Flags targeting rules from the CLI

Short summary

Vercel now lets you manage Vercel Flags targeting rules directly from the CLI with the `vercel flags rules` command. You can add, reorder, and inspect rules using the same model as the dashboard, including entity/segment targeting, weighted splits, and progressive rollouts. Environments can inherit flag configs from other environments, with automatic switching to local config when rules are modified.

• •New CLI command `vercel flags rules` for managing flag targeting rules
• •Supports entities, segments, weighted splits, progressive rollouts, and JSON output
• •Environment inheritance with automatic local-config switching on rule changes

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