chore(main): release 6.0.0

[alex-feel]

🚀 New Release

6.0.0 (2026-04-13)

⚠ BREAKING CHANGES

• generate_env_loader_files() no longer creates toolbox-env.sh, toolbox-env.fish, toolbox-env.ps1, or toolbox-env.cmd in ~/.claude/. Users who manually sourced these files should open a new terminal instead, which loads variables from shell profiles. Per-command env.* files in ~/.claude/{cmd}/ are unaffected.

Chores

• remove toolbox-env.* global file generation (718f53e)

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