[FEATURE] per-session autoCompactEnabled override for concurrent sessions

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

I want to be able to simultaneously run a Claude session with autocompact on and another one with autocompact off, on the same machine.

Proposed Solution

Add a per-session overwrite for the autoCompactEnabled global setting, e.g. claude --sessionAutoCompact [boolean]

Alternative Solutions

Currently I believe you can work around this by creating a second config directory and using the CLAUDE_CONFIG_DIR environment variable

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

I want to be able to launch Claude Code in long-running Ralph loops for simple tasks, while managing context manually on tasks I am actively monitoring and steering

Additional Context

_No response_