CMB (r4_combined_rate) now participates in route_setup and bounded contemplation. R1/R2/R3 readers/
solvers, the CMB reader/solver/oracle, and serving are all UNCHANGED — pure shared-infra integration,
no new comprehension capability (that was CMB-c).
- model.py: Organ += r4_combined_rate.
- classify.py: classify_cmb + _cmb_signature (organ-tagged, cross-organ-distinct) + cmb_reason —
namespaces CMB reasons cmb_* before the reason-string-keyed registry sees them, so a CMB boundary
never inherits R2/R3's family for the SAME bare string (R3 rate_unit_mismatch is a GROWTH surface;
R2/R3 non_integer_solution carry other owners). not_combined_rate_shaped/empty stay bare -> the
cross input_shape family (router hygiene).
- failure_family.py: Owner += r4; input_shape += not_combined_rate_shaped; 8 CMB families
(must_remain_refused: cmb_unit_mismatch [until a dimension registry exists — NOT forever],
cmb_combine_ambiguous, cmb_underdetermined, cmb_non_positive_net, cmb_non_integer; proposal_allowed
-> cmb_gold_fixture: cmb_unsupported_rate_count/_reciprocal/_clock_interval).
- pass_manager.py: _solve_and_verify_cmb (solver Refusal -> REFUSED_KNOWN_BOUNDARY, never a proposal).
CMB-over-R3 domain-precedence rule (cmb_is_authoritative): when CMB POSITIVELY recognizes
combined-rate shape (a setup, or a substantive cmb_* refusal — NOT the input_shape step-aside), R3's
broader single-rate over-read of the SAME text is inadmissible — for BOTH routing (veto R3
setup_correct) and family attribution (suppress R3 so CMB's sharper diagnosis owns the
terminal/proposal). This came from a pre-build cross-organ pressure-test: R3 reads 'Anna and Ben
paint together; Anna paints 3 rooms/hour. How many do THEY paint in 4 hours?' as a single rate and
would confidently answer a wrong 12. The rule fixes that (-> REFUSED) without touching R3. It does
NOT mean 'CMB always wins': on input_shape CMB cedes (a plain single-rate car problem routes to R3
and solves 180). Narrow CMB<->R3 instance of a future general domain-specificity adjudication.
Tests: new test_cmb_router_contemplation (full terminal matrix; cmb-11 veto-no-wrong-answer; cmb-15
cede-to-R3; solver-refusal-never-proposes; CMB-owned proposal-only artifacts mounted:false; no gold
ambiguous; off-serving AST). Extended router-organ-hygiene to CMB x R1/R2/R3 (0 breaches).
test_setup_router/test_r3_router_contemplation attempt-count 3->4; test_failure_family ALL_REASONS +
growth set. 97 CMB-d tests; 597 broad-net pass (1 unrelated pre-existing red); CMB organ lanes green.
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