Feature request: named profiles for multi-identity workflows (work + personal)

Problem

Users who straddle work and personal accounts on one machine have no way to scope Claude Code actions to a specific identity. Everything — gh auth, MCP tokens, git config, settings — is globally shared across the session.

Concrete example: I needed to file a GitHub issue from my personal account (sreedeepnarayan) but my session is authenticated as my work account (sreedeepnarayan-atari). There's no way to do this without switching global gh auth, which disrupts all other work in the session.

Proposed solution

Named profiles, e.g.:

claude --profile personal
claude --profile work

Each profile would scope:

• GitHub auth (gh identity)
• MCP server tokens (separate OAuth sessions per profile)
• Git user config (name/email)
• Settings overrides (different CLAUDE.md, permissions, hooks)

Alternatives considered

• gh auth switch per command — partial fix for GitHub only, doesn't cover MCP tokens or git identity
• Separate macOS user accounts — too heavy, breaks workflow continuity
• Cross-session clipboard/handoff — lighter version where one Claude session can export a task (issue body, PR description, etc.) for another session to pick up under a different identity

Use cases

• Filing personal GitHub issues while working in a corporate repo
• Keeping work Slack MCP tokens separate from personal workspace tokens
• Contributing to open-source repos with a personal git identity mid-workday
• Any dual-identity developer workflow