[BUG] Irrecoverable Sessions if Toolcall canceled before completion

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: v1.0.22
• Operating System: Ubuntu 24.04.2 LTS + MacOS
• Terminal: Wezterm, Terminal.

Bug Description

• If a Toolcall is interrupted by user before finishing, the session becomes corrupted and progress is irrecoverable.
• This was incorrectly marked as resolved previously (but the issue still exists, per screenshot).

Steps to Reproduce

1. Start a Claude Code session, initiate tool call action (e.g, delegate subtask).
2. Type CTRL+C before it completes.
3. Observe that any following input will result in a tool call error; the session is now unusable and not possible to recover.

Expected Behavior

• Session will handle tool call interruption without becoming corrupted.

Actual Behavior

• Session becomes irrecoverable after interrupting a Task tool call (despite it exactly matching the expected workflow of interrupting a normal message).

Additional Context

• This was supposedly fixed in #473 - but per attached screenshot, is not actually addressed.
• The suggested "esc, then pick a previous message" does NOT work - it reverts all progress made.
• Since progress made was 3x 270k tokens - losing this is pretty hard to accept as a paid feature.

Screenshot:

<img width="1198" alt="Image" src="https://github.com/user-attachments/assets/cf238179-ceb6-4219-9e44-5f08d0308c0d" />