Declares SemanticSymbolicBindingGraph the universal problem-structure interlingua
(the corpus callosum where the geometric field and symbolic ROBDD decodings meet
and must agree). INV-26 enforces that neutrality structurally: 26a no binding-graph
module imports field/algebra/eval/vault/chat/core/sensorium; 26b the core imports
no domain reader (only allowlisted bridges adapter/question_target may); 26c proven
non-vacuous (flags pipeline.py's field import + the adapter's domain import).
Amends the plan doc with the structurally-diverse checkable panel (logic/grounding/
dimensional/execution/constraint, each with independent gold) and the 'a capability
change must move >=2 structurally-distinct domains or it is suspected overfitting'
rule, woven in from Phase 2 — the anti-overfit instrument the train_sample breach
proved we need.
Validated: architectural invariants 49 + binding_graph model = 118 passed.
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