[emirykl]

Summary

• Validate duplicate active keys and unsafe secret-shaped values in the root and web .env.example files.
• Add focused tests, a CI workflow, and brief documentation.

Test evidence

• 6 focused tests passed.
• Both committed templates passed validation.
• Node syntax checks, documentation link check, and git diff --check passed.

Fixes #528

Verification

• 6 focused tests passed
• Both committed templates passed validation
• Node syntax checks passed
• Documentation link check passed
• git diff --check passed

Diagnostics

Recovered command failures: /bin/zsh -lc "ls -la .github/workflows scripts && rg -n 'check-|node --test|npm |pnpm |env.example|preinstall|postinstall|prepare|folderOpen' .github/workflows package.json apps/web/package.json scripts README.md CONTRIBUTING* .vscode 2>/dev/null" (1), /bin/zsh -lc "ls -la && rg --files --hidden -g 'AGENTS.md' -g '"'!node_modules'"' -g '"'!.git'"' && rg --files --hidden .github/workflows" (1), /bin/zsh -lc "node --version && sed -n '1,130p' docs/DEPLOY.md && git status --short && rg --files --hidden -g 'AGENTS.md' -g 'CONTRIBUTING*' -g '"'!.git'"' ." (1), /bin/zsh -lc 'node --test scripts/check-env-examples.test.mjs && node scripts/check-env-examples.mjs' (1)