refactor: extract createUserMessage helper to reduce duplication

0.1.11

feat: populate selectedContextBlob on UserMessage

feat: align protobuf fields with Cursor's current API

fix: store turn data as nested blob references matching Cursor's format

feat: implement blob store for conversation turns

fix: use fresh conversationId when no checkpoint exists

refactor(checkpoint): remove fingerprint-based validation, rely on pi session hooks

fix(checkpoint): persist checkpoints immediately on receipt and handle stream interruptions

Add extension-side session debug hooks

Add debug log timeline summarizer

Fix partial in-flight tool continuation handling

Add env-gated proxy debug logging

Switch tests to Vitest and update README

Add deterministic session integration coverage