Package pi plugin for npm + add automated release workflow

[benvinegar]

Summary

This PR makes the pi integration installable as an npm package and adds a repeatable release workflow.

What changed

• Added pi/package.json for @modem-dev/glance-pi with a pi.extensions manifest.
• Updated docs to make npm install the primary path:
  • pi install npm:@modem-dev/glance-pi
  • plus local-checkout and manual fallback options.
• Added release automation:
  • .github/workflows/release-pi.yml
  • publishes on pi-v* tags
  • supports manual dry-run / publish via workflow_dispatch
  • validates tag/version match and fails if version is already on npm
  • publishes with npm provenance.
• Updated plugin repo policy docs to require package-based install paths and release automation for new plugins.

Why

Install instructions were too manual and fragmented. This gives users a one-command install path and maintainers a predictable publishing flow.

Validation

• Ran npm pack --dry-run in pi/ to verify package contents.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​mariozechner/​pi-coding-agent@​0.57.1
	@​mariozechner/​pi-tui@​0.57.1
	@​mariozechner/​pi-ai@​0.57.1

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