`<ide_opened_file>` IDE context tag pollutes session title and prompt display

[shurkanTwo]

What happened?

When a session is created via Claude Code running inside the VS Code
extension, the IDE prepends an <ide_opened_file>...</ide_opened_file>
context block to the user's prompt. The CLI surfaces this injected block
verbatim in both the session/checkpoint title and the rendered prompt
body, instead of showing only the user's actual message. The result is a
"dirty" title and prompt cluttered with IDE context that the user never typed.

Steps to reproduce

1. Open any file in VS Code with the Claude Code extension active.
2. Send a prompt to Claude Code (e.g. "rewrite these docs as one plan").
3. The IDE silently prepends an <ide_opened_file>...</ide_opened_file>
   block to the message before it's sent.
4. Open the session in the web viewer.

Entire CLI version

Entire CLI 0.7.5; Go version: go1.26.4

OS and architecture

OS/Arch: linux/amd64

Agent

Claude Code

Terminal

No response

Logs / debug output

Additional context

No response