feat(health): expose app version in health response (#624)

[benedictworks-home]

• Add listener/src/utils/app-version.ts with getAppVersion() and APP_VERSION
• Version is read from listener/package.json at module load time (zero I/O at runtime)
• Walk up directory tree so it works from both src/ (ts-node) and dist/ (compiled)
• Falls back to 'unknown' if package.json is missing or unreadable
• Add 'version' field to HealthResponse interface in events-server.ts
• buildHealthResponse() now includes version: APP_VERSION in every response
• Add 8 unit tests in app-version.test.ts covering happy path and all failure modes
• Update events-server.health.test.ts to assert version field is present
• Update jest.config.js: warnOnly diagnostics to allow pre-existing TS errors to be suppressed as warnings rather than hard test failures

Closes #624

Overview

Related Issue

Closes #

Changes

Verification

# e.g.
cd dashboard && npm test
cd listener && npm run typecheck && npm test
cd contract/contracts/hello-world && cargo test

How to Test

Checklist

• Branch is up to date with main
• Tests added/updated and all pass locally
• cargo fmt --all run (if Rust changes)
• npm run lint passes (if TypeScript changes)
• Documentation updated if behavior changed

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