Support contribution to chat execute menu (for contributed agents)

[rebornix]

No description provided.

[bpasero]

Can we first have a discussion and plan for how we envision the delegation to work? In my mind it should go into the send-dropdown but offer a way to promote actions back to the top if the user wants to.

For reference, the dropdown was removed in #271950

[rebornix]

@bpasero yep for sure. I'm not keen on having the delegate button (but mostly want to self host if it ever makes sense for CLI). One thing worth mentioning that CLI has a different gesture for "delegate". The last time when I tried it, it sends request to the cloud, and clears the whole local CLI session. It's a big surprise to me at the time.

[bpasero]

I would like delegation to work like this, no matter where you delegate to:

• your local chat remains functional and visible
• you see a response in that chat that something was delegated (and a link to open the task)
• a new agentic session appears in the view reporting progress
• NO editor opens automatically unless I do a user action

[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

@lszomoru

Matched files:

• extensions/git/src/commands.ts

[Copilot]

Pull Request Overview

This PR adds support for contributing to the chat execute menu for contributed agents and includes refactoring of git worktree migration logic.

• Adds a new chat/execute menu contribution point under the chatSessionsProvider proposed API
• Refactors git worktree migration code to eliminate duplication and add support for migrating uncommitted changes when creating worktrees
• Extracts common stash migration logic into a reusable method with parameterized source/target repositories

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/vs/workbench/services/actions/common/menusExtensionPoint.ts	Adds the chat/execute menu entry to the extension point registry for supporting chat execute menu contributions under the proposed chatSessionsProvider API
extensions/git/src/commands.ts	Refactors worktree migration logic by extracting duplicate code into migrateStashBetweenRepositories, adds new migrateChangesToWorktree method, and extends createWorktreeWithDefaults to optionally migrate uncommitted changes to newly created worktrees