Fix agent host worktree terminal cwd

[roblourens]

Fixes Agent Host Copilot shell terminals created for worktree-isolated sessions so they start in the resolved worktree directory instead of the Agent Host process cwd.

Summary:

• Pass the resolved session working directory into ShellManager on create and resume paths.
• Use that directory as the default cwd when shell tools create Agent Host terminals, while preserving explicit cwd overrides.
• Add unit coverage for the ShellManager cwd fallback.
• Extend the real SDK worktree integration test to run pwd in the shell terminal and verify the terminal cwd/output matches the resolved worktree path.

Validation:

• VS Code build task clean: Core Transpile, Core Typecheck, Ext Build, Copilot Build.
• node --experimental-strip-types build/hygiene.ts src/vs/platform/agentHost/node/copilot/copilotAgent.ts src/vs/platform/agentHost/node/copilot/copilotShellTools.ts src/vs/platform/agentHost/test/node/copilotShellTools.test.ts src/vs/platform/agentHost/test/node/protocol/toolApprovalRealSdk.integrationTest.ts
• AGENT_HOST_REAL_SDK=1 ./scripts/test-integration.sh --run src/vs/platform/agentHost/test/node/protocol/toolApprovalRealSdk.integrationTest.ts --grep "worktree session uses the resolved worktree as working directory"

(Written by Copilot)

[github-actions]

Screenshot Changes

Base: ea34727c Current: 7fbe1808

Changed (8)

editor/inlineChatAffordance/InlineChatOverlay/Light

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agentSessionsViewer/CompletedRead/Dark

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[Copilot]

Pull request overview

Ensures Agent Host Copilot shell terminals created for worktree-isolated sessions start in the resolved worktree directory (instead of the agent host process cwd), and adds regression coverage around cwd fallback behavior.

Changes:

• Pass the resolved session working directory into ShellManager on both create and resume paths.
• Use the session working directory as the default terminal cwd for shell tool terminals when no explicit cwd override is provided.
• Add unit + real SDK integration coverage asserting terminal cwd/output matches the resolved worktree path.

Show a summary per file

File	Description
src/vs/platform/agentHost/node/copilot/copilotAgent.ts	Creates ShellManager with the resolved session working directory on create/resume paths.
src/vs/platform/agentHost/node/copilot/copilotShellTools.ts	Uses workingDirectory.fsPath as the fallback cwd when creating shell terminals.
src/vs/platform/agentHost/test/node/copilotShellTools.test.ts	Adds unit coverage for cwd fallback vs explicit override (needs cross-platform fix).
src/vs/platform/agentHost/test/node/protocol/toolApprovalRealSdk.integrationTest.ts	Extends real SDK worktree test to validate terminal cwd and pwd output match resolved worktree.

Copilot's findings

• Files reviewed: 4/4 changed files
• Comments generated: 2