71eff35d68
Task 4 of the slice plan. Adds initLogger() (rotates daily logs
under {userData}/Inkling/logs at 5MB cap, info level by default
and debug when INKLING_DEBUG=1), a hashPrefix() helper for
safely referencing note IDs in logs without exposing content,
and a typed logger facade with info/warn/error/debug methods.
Wires initLogger() + an app.start info entry into the
whenReady hook.
Verification: `npm run typecheck` exits 0. Runtime log file
creation deferred to live `npm run dev` once Tasks 3+19 land.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>