fix: use PROJECT_ROOT helper for all path resolution #327

Job	Run time
Unit Tests (Node 22)	1m 57s
Web Tests	33s
Lint	18s
Unit Tests (macOS)	2m 13s
Typecheck	27s
Unit Tests (Node 20)	1m 56s
Secret Scan (gitleaks)	4s
Server Unit Tests	27s
Server DB Integration Tests	32s
Repo Provider Integration Tests	18s
E2E Tests	38s
Coverage Report	2m 2s
Docker Build & Push	1m 29s
Publish to npm	2m 26s
	15m 20s

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