fix(BetaToolRunner): Fix infinite loop logic and message loss when compaction occurs

[mineoka-kento]

Problem

Currently, the BetaToolRunner logic inside the while loop places the message pushing and tool execution logic inside an if (!isCompacted) block.
This causes two critical issues when compaction occurs:

1. Infinite Loop: The loop termination condition (break) is skipped, causing an infinite loop.
2. Message Loss: The current assistant message (containing tool_use) is not added to the history because the push operation is skipped. Since checkAndCompact only summarizes existing history and does not include the current message, the current message is effectively lost. This breaks the conversation flow and prevents tool execution.

Solution

I removed the if (!isCompacted) condition wrapping the message handling logic.
Now, the runner performs steps sequentially:

1. Checks and compacts history if needed.
2. Always pushes the current assistant message to history (ensuring the context is preserved even after compaction).
3. Checks for tool execution and handles results or breaks the loop.