refactor: delete unused replaceLog and silence helpers

[arbazkhan971]

Summary

Deletes replaceLog and silence from lib/log.ts.

Neither had a caller in shipped source, and index.ts does not re-export them. The SDK already injects a logger per Api / Driver instance. The default logger stays silent, and warn still forwards to warning (now covered by a unit test).

Test plan

• npx tsc --noEmit
• npm run lint
• npx jest lib/__tests__/log.spec.ts

Fixes #380

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