feat(cli): add interactive dev mode with prompts and watch

[arindamdawn]

Summary

Add schemasentry dev interactive mode with prompts and watch mode.

Changes

• New dev command with prompt-driven selection (validate/audit/suggest)
• Watch mode to re-run on file changes
• Adds @inquirer/prompts + chokidar dependencies
• Documentation updates for dev mode

Usage

# Prompt-driven selection
pnpm schemasentry dev

# Run validate once
pnpm schemasentry dev --action validate --once

# Watch for changes
pnpm schemasentry dev --action validate --watch ./app schema-sentry.manifest.json

# Suggest with prompts
pnpm schemasentry dev --action suggest

Notes

• Uses existing CLI commands under the hood
• Watcher debounces to avoid overlapping runs