[Feature Request] Disable auto-completion and provide version pinning to prevent unintended input loss

Bug Description
STOP THE AUTO GUESS WHAT I WANT TO DO NEXT> I JUST LOST A PARAGRAPH OF INPUT TEXT BECUAE I HIT TAB> YOU GUYS ARE DOING TO MUCH AND I HAVE NO TIME TO GET USED TO YESTERDAYS CHANGES WHILE YOU PUT IN MORE FOR TODAY> MAKE IT EASY FOR VERSION PINNING> I DON"T WANT TO AUTO UPGRADE

Environment Info

• Platform: linux
• Terminal: tmux
• Version: 2.0.69
• Feedback ID: 25260549-b991-4585-af25-8ead3c296188

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /home/zinglax/.local/share/claude/versions/2.0.69 (expected in multi-process scenarios)\n    at jf$ (/$bunfs/root/claude:2239:2155)\n    at LDA (/$bunfs/root/claude:2239:1875)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-14T01:59:35.545Z"},{"error":"Error: Failed to fetch version from https://storage.googleapis.com/claude-code-dist-86c565f3-f756-42ad-8dfa-d59b1c096819/claude-code-releases/latest: timeout of 30000ms exceeded\n    at Zt0 (/$bunfs/root/claude:2237:1038)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-14T02:00:07.255Z"},{"error":"Error: Failed to fetch version from latest: AxiosError: timeout of 30000ms exceeded\n    at Zt0 (/$bunfs/root/claude:2237:1093)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-14T02:00:07.256Z"},{"error":"Error: Request was aborted.\n    at _createMessage (/$bunfs/root/claude:413:3151)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-14T02:09:41.050Z"},{"error":"Error: Failed to fetch version from https://storage.googleapis.com/claude-code-dist-86c565f3-f756-42ad-8dfa-d59b1c096819/claude-code-releases/latest: timeout of 30000ms exceeded\n    at Zt0 (/$bunfs/root/claude:2237:1038)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-14T02:18:39.679Z"},{"error":"Error: Failed to fetch version from latest: AxiosError: timeout of 30000ms exceeded\n    at Zt0 (/$bunfs/root/claude:2237:1093)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-14T02:18:39.680Z"}]