Claude Code Late-June v2.1.x Fixes: Background-Session Env-Var Bleed, Model-Restriction Leaks, Mouse Selection

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Claude Code's late-June v2.1.x updates (changelog through June 24-26) fix background sessions inheriting another session's ANTHROPIC_* provider environment variables, a 1-2s exit pause after interrupting a shell command on macOS/Linux, and org-configured model restrictions leaking into the model picker, --model, /model, and ANTHROPIC_MODEL. Mouse-click selection was also added to fullscreen select menus. These are reliability fixes distinct from the earlier 2.1.191 /rewind release.