Add Vitest coverage for the Pi plugin

[benvinegar]

Summary

• add a Vitest + TypeScript test harness for this repository
• add coverage-focused tests for the Pi glance plugin lifecycle, command, tool, and SSE behavior
• fix SSE event parsing so chunked server-sent events are handled correctly

Testing

• npm run test:coverage
• npm exec -- tsc --noEmit

[socket-security]

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

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​vitest/​coverage-v8@​3.2.4
	vitest@​3.2.4
	@​types/​node@​22.19.15
	typescript@​5.9.3

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