[FEATURE] per-project account configuration

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Allow configuring which Claude account to use per project directory, so users with separate work/personal accounts don't accidentally use the wrong one. Similar to how Git supports per-repo user.email config.

Proposed Solution

I believe that the best way to manage that would be in .claude project folder.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

Configuration and settings

Use Case Example

I have my private subscription with Claude Code, and my company just provided me with a company subscription.

I cannot use my company subscription on my private projects and for that, currently I need to be logging out and logging back in using correct account.

This is prune for errors as I might mistakly forget and use wrong account, either spending my tonkens on my company messy project or using company account on my personal projects.

Additional Context

_No response_