fix(refs): CAS guards on merge, cherry-pick, revert, pull, rebase
Phase 1 of data integrity audit (issue #7): all write_branch_ref callers that advance an existing branch now pass expected_id for CAS protection. RefConflictError surfaced as a retryable user error on mismatch.
Commands fixed: merge (3 sites), cherry-pick (1), revert (1), pull (3), rebase/squash/continue (4). Abort path left unconditional (intentional restore).
11-test regression suite in test_phase1_cas_branch_ref_callers.py using race injection pattern: patches write_branch_ref to advance the branch just before the real write, proving CAS detection without threading.
sha256:8f54a2ad8f91a756ccce8819b0531f2f5b4309ce619ffae7b50bc9c56bd301f3
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sha256:d1eafd5bce0dfbbc3d65d514a5f81a50505fc8306e1d8c57c93eadfc850d7150
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