fix(bash): honor cwd for backgrounded shell commands

[Fnine59]

Related Issue

Resolve #2890

Problem

The Bash tool prepends cd <cwd> && to the user's shell script. If the first user command is backgrounded with &, Bash backgrounds that entire AND-list, including cd, so later lines silently run in the process's original directory.

What changed

Pass cwd through the process execution boundary in both engine implementations and leave the bash -c input as the user's command. Bash also receives the requested path as its logical PWD, preserving symlinked workspace paths; on Windows the process receives a native cwd while Git Bash receives the corresponding POSIX-style PWD. Relative cwd values continue to resolve from the session working directory using the target platform's path rules.

Added a regression test that backgrounds the first command and verifies the following line remains in the requested directory, a real symlink-workspace test with a stale inherited PWD, and spawn-boundary assertions for both implementations.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 2a1ccef

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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[Fnine59]

@sailist Hi — a concise review-ready update: the automated review findings were addressed, including preserving the logical PWD for symlinked workspaces in both engine implementations. The PR includes regression coverage for the process boundary plus POSIX and Windows behavior, and the resolved review threads document the verification. When you have a chance, could you take a look? Happy to adjust anything you’d prefer.