Better sessions terminal tracking

[benibenj]

Copilot Generated Description: Improve tracking of externally created terminals by associating them with the active session based on their current working directory. Add functionality to hide terminals that do not match the active session's context. Include a new action to dump terminal tracking information for debugging purposes.

[Copilot]

Pull request overview

This PR improves terminal tracking in the Agent Sessions window by attempting to “adopt” terminals created outside the contribution (eg restored/external terminals) into the active session based on their initial working directory, and by hiding terminals that cannot be related to the active session. It also adds a command for dumping terminal tracking state for debugging.

Changes:

• Adopt (or hide) externally-created/restored terminals by comparing their initial cwd against the active session context.
• Add a debug action/command to dump tracked vs untracked terminals.
• Extend the sessions terminal contribution tests to cover adoption/hiding behavior for external terminals.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/vs/sessions/contrib/terminal/browser/sessionsTerminalContribution.ts	Adds external terminal adoption logic, introduces a dump-tracking command, and adjusts creation handling to avoid immediately backgrounding untracked terminals.
src/vs/sessions/contrib/terminal/test/browser/sessionsTerminalContribution.test.ts	Adds terminal instance stubs that support getInitialCwd() and new tests validating adoption/hiding behavior.

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