Copilot CLI v1.0.83-0 adds mTLS client certificates for proxied model and web requests

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Released 31 August 2026 at 14:46 UTC, Copilot CLI 1.0.83-0 adds automatic HTTPS-proxy mTLS client certificate support for both model and web requests, which is the piece corporate egress proxies usually require. It also detects the herdr terminal multiplexer instead of mistaking it for tmux (restoring Kitty keyboard protocol, color-scheme following, terminal progress, `/copy` and notifications inside herdr panes), groups `/sandbox` path grants by source while showing detected developer tools, and fixes `--share`/`--share-gist` on a resumed session writing only the latest run instead of the whole transcript.