/kiro-discovery investigation of removing src/frontend/Makefile in favor
of Meson as the sole build system. Records the quick investigation's
findings (5 boundary seams, current-state evidence that build-cli/
build-server are already dead from /xce-build's perspective and
build-server is already broken today) and the user's confirmed decision
to fully remove the Makefile rather than keep a compat wrapper.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AgYRU3zDTqNGV5Jk8aiKLg
