Per local/AGENTS.md § "BRANCH AND SUBMODULE POLICY (ABSOLUTE)":\neach Red Bear fork worktree must be on the canonical\n"submodule/<name>" branch. Until now, the build system had NO\ncode enforcing this — drift was caught only by operator discipline\n(Round-21 hand-normalized 6 of 9 forks).\n\nAdd a new redbear_check_fork_branches() function called as a peer of\nthe existing dirty-source gate. It iterates REDBEAR_FORK_SOURCES,\nreads each fork worktree's current branch via 'git branch\n--show-current', and compares to 'submodule/<label>'. On mismatch\nthe build aborts with a clear error message and a documented fix\nrecipe. Escape hatch: REDBEAR_ALLOW_WRONG_BRANCH=1.
vasilito
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