Add testing framework with 48 unit tests, 8 E2E tests, and demo app#1

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aaronDowning wants to merge 3 commits intooojacoboo:mainfrom

aaronDowning:feat/testing-framework

Commits on Apr 13, 2026

Add testing framework with spec-validation tests and E2E demo
atxnllc-aloha
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Add testing section to README with run commands and coverage table
atxnllc-aloha
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Add vitest config to exclude e2e tests from unit test runner
atxnllc-aloha
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