--bare flag strips auth credentials, making it non-functional

Summary

claude -p --bare 'hello' returns "Not logged in · Please run /login" on a session that is fully authenticated without --bare.

Steps to reproduce

claude -p 'hello'           # works fine
claude -p --bare 'hello'    # "Not logged in · Please run /login"

Expected behaviour

--bare strips environmental contamination (CLAUDE.md, hooks, MCP, plugins, settings) but auth is not part of the environment — it is identity. A bare session should still use the existing session credential.

Actual behaviour

The session token / OAuth credential is not found when --bare is active, making the flag completely non-functional.

Environment

• Claude Code version: 2.1.177
• Platform: macOS Darwin 25.5.0
• Auth method: OAuth (not API key)