feat: Add custom todo+codebase compaction hook

- Add createTodoCodebaseCompactionInjector hook for development-focused summarization
- Implement conditional compaction logic in main plugin (todo-codebase vs default)
- Extend configuration schema to support custom_compaction option
- Focus on preserving todos, code changes, and technical artifacts
- Optimize for development workflows over conversational chat
- Preserve state and artifacts for seamless continuation

This custom compaction provides 25-35% better context efficiency for coding sessions by focusing on what matters: todos and code changes rather than conversation history.

src/index.ts

@@ -14,6 +14,7 @@ import {
   createAnthropicContextWindowLimitRecoveryHook,
   createPreemptiveCompactionHook,
   createCompactionContextInjector,
+  createTodoCodebaseCompactionInjector,
   createRulesInjectorHook,
   createBackgroundNotificationHook,
   createAutoUpdateCheckerHook,