Agents - scaffold Changesets model

[lszomoru]

No description provided.

[Copilot]

Pull request overview

This PR scaffolds a “changesets” concept into the Sessions/Agents window model by introducing a new ISessionChangeset type and plumbing a changesets observable through session/chat facades and key providers, with tests updated to satisfy the new interface shape.

Changes:

• Add ISessionChangeset and new changesets observables to IChat and ISession.
• Plumb empty/default changesets observables through Copilot chat sessions + agent host providers.
• Update multiple Sessions-layer tests to include changesets in stubs/fixtures.

Show a summary per file

File	Description
src/vs/sessions/services/sessions/common/session.ts	Introduces ISessionChangeset and adds changesets to IChat/ISession.
src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts	Adds changesets to the Copilot sessions facade and adapters; currently scaffolded as empty.
src/vs/sessions/contrib/agentHost/browser/baseAgentHostSessionsProvider.ts	Adds a changesets observable to agent-host session/chat models.
src/vs/sessions/services/sessions/test/browser/sessionsManagementService.test.ts	Updates session/chat stubs to include changesets.
src/vs/sessions/contrib/terminal/test/browser/sessionsTerminalContribution.test.ts	Updates test session fixtures to include changesets.
src/vs/sessions/contrib/sessions/test/browser/sessionsListModelService.test.ts	Updates test session factory to include changesets.
src/vs/sessions/contrib/sessions/test/browser/sessionsList.test.ts	Updates test session factory to include changesets.
src/vs/sessions/contrib/github/test/browser/githubContribution.test.ts	Updates ISession test implementation to include changesets.
src/vs/sessions/contrib/chat/test/browser/sessionsConfigurationService.test.ts	Updates session fixtures to include changesets.
src/vs/sessions/contrib/agentHost/test/browser/agentHostSkillButtons.test.ts	Updates active session test fixture to include changesets.

Copilot's findings

Comments suppressed due to low confidence (1)

src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts:914

• AgentSessionAdapter.update() updates _changes but does not update the newly introduced _changesets. If changesets are ever computed from the agent session, this adapter will stop reflecting updates after construction. Update update() to also set _changesets from _extractChangesets(session) (and consider updating it in the same transaction alongside _changes).

		this._changesets = observableValue<readonly ISessionChangeset[]>(this, this._extractChangesets(session));
		this.changesets = this._changesets;

		this._changes = observableValue<readonly ISessionFileChange[]>(this, this._extractChanges(session));
		this.changes = this._changes;

• Files reviewed: 10/10 changed files
• Comments generated: 3

[github-actions]

Screenshot Changes

Base: 44ffe22e Current: 71a3a8db

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