Context bloats up after a conversation fork

What version of the IDE extension are you using?

26.527.31454

What subscription do you have?

Pro

Which IDE are you using?

VS Code Version: 1.122.1

What platform is your computer?

Linux (Debian dev container on Mac host)

What issue are you seeing?

Before the fork 38% left:

<img width="1185" height="649" alt="Image" src="https://github.com/user-attachments/assets/a2607eca-d2fa-4746-9914-aeac2082bbe2" />

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After the fork 29% left:

<img width="1172" height="574" alt="Image" src="https://github.com/user-attachments/assets/65055478-9f47-493d-ad19-eee448daed9a" />

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So, significant bloat up.
If anything, the post-fork should be smaller.
The fork eliminated only 2 small follow-up messages.
There was no compaction in-between.

What steps can reproduce the bug?

• for the conversation
• the fork has more bloated context

What is the expected behavior?

• the fork should be smaller context

Additional information

_No response_