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efc7e113 - Document critical security limitations of agent firewall before Copilot Coding Agent GA (#57522)

Document critical security limitations of agent firewall before Copilot Coding Agent GA (#57522) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: timrogers <116134+timrogers@users.noreply.github.com> Co-authored-by: Tim Rogers <me@timrogers.co.uk> Co-authored-by: Tim Rogers <timrogers@github.com> Co-authored-by: Sophie <29382425+sophietheking@users.noreply.github.com>