cctx adds Claude Code profile switching

This is the kind of tiny CLI that becomes plumbing once Claude Code is in your daily loop.

• –Separate profiles reduce permission bleed and make it safer to bounce between work, personal, client, and demo setups.
• –The predictable-defaults approach is the right tradeoff; auto-detecting context by directory would be clever, but it would also make mistakes harder to spot.
• –Rust and a single binary fit the job: fast startup, easy installs, and minimal runtime baggage for a tool you may run constantly.
• –Backups plus import/export make contexts portable, so the tool works for one machine and for teams that need to share hardened configs.
• –Claude Code users are already running into permission churn and `settings.json` workarounds, so cctx is solving a live operational pain rather than inventing a niche preference.