fix(debug-log): include app version in the System Info header

[greatcoat]

Problem: Customer debug logs record platform, Node, and Electron versions but not the app's own version, so the first triage question — which release produced this log — is unanswerable.

Fix: Add appVersion: app.getVersion() as the first field of the System Info header that debugLogger writes when file logging initializes; regression test covers the header contents.

Root cause

debugLogger.initializeFileLogging() logs a System Info header built only from process-derived fields; app.getVersion() was never included, and nothing else in the log carries the release version.

Tests

• RED: new test/helpers/debugLogger.test.js (electron mocked via require-cache, per the existing downloadUtils.test.js pattern) fails on current main: The input did not match the regular expression /appVersion/.
• GREEN: passes with the fix; full suite 2091 tests, 0 fail (170 = known Electron-ABI better-sqlite3 local skips).

Provenance

Contributing defect #4 from the CUS-113 RCA (Titan wiki/areas/engineering/whisper-server-dll-not-found-rca.md): triaging debug-2026-08-17T12-23-22-137Z.log required inferring the app version 1.8.x from Electron 41.10.0. Companion packaging fix: #1687.

🤖 Generated with Claude Code

[Chadpiha]

Thanks Josh! The fix correctly adds the application version to the debug log’s System Info header and keeps the current Electron test doubles aligned with the new API. I verified both startup and runtime debug-logging paths, with 14/14 targeted tests and the full 3,208-test suite completing with 0 failures. No regressions, cross-platform concerns, or API/dependency changes found.