feat: add a source tool to webjs mcp to read the no-build framework source #412

Job	Run time
Build (@webjsdev/core dist)	18s
Unit + integration (node --test)	47s
Conventions (webjs check)	21s
In-repo app tests (website + blog)	48s
Browser (web-test-runner / Playwright)	48s
E2E (Puppeteer against the blog example)	4m 49s
	7m 51s

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