A.19.CN:4.3 - Bridges between exact local meanings

When two CN-frame uses rely on different exact F.17 local senses, cite an obtaining F.9 Bridge between those cells. A compact record can expose the information needed by the receiving use:

Bridge <source F.17 cell> → <target F.17 cell>
  direction: <source-to-target use>
  correspondence_rule: <how the local claims correspond>
  applicable_use: <the receiving comparison or aggregation>
  kept_characteristics: [… ]
  lost_characteristics: [… ]
  tolerated_loss: <declared limit>
  transform: {pullback | pushforward | re-scaling | re-binning | … }
  plane_relation_ref?: <only when a separately defined plane relation obtains>
  extra_guards: {additional evidence, review assignment, or waiver speech act}

The Bridge establishes only the exact sense relation. A claim that uses it for comparison, admission, or aggregation remains a separate C.2.1 use claim with its direction, rule, and tolerated loss, together with the A.10 provenance account and any B.3 assurance result required for that use. No Bridge follows from matching names, and no reverse direction follows automatically. B.3 supplies any current loss effect on assurance; CN‑Spec may add operational guards but does not redefine that calculus.