test(tdx-hydro): record pre-pass classifications

[CooperBigFoot]

Summary

• Adds a standalone, read-only instrument that mirrors the orientation-independent endpoint-matching pre-pass at revision 1385b56bccd4758aea0d04882eee6edadcefe05b.
• Records all 335,296 connected edges in basin 2020003440: 331,077 SINGLE_ADMISSIBLE, 4,219 NEAR_DEGENERATE_ADMITTED, and zero NON_COINCIDENT or REACH_SIDE_REFUSED.
• Records all 659,418 connected edges in basin 2020071190: 648,586 SINGLE_ADMISSIBLE, 10,832 NEAR_DEGENERATE_ADMITTED, and zero NON_COINCIDENT or REACH_SIDE_REFUSED.
• Reproduces the post-clamp WGS84 geodesic-area and topology-order math.fsum DSContArea derivation for both basins.
• Verifies that recorded class counts derive the committed total and that every two-current-endpoint record retains the complete, deterministically ordered candidate-pairing cross product, including above-tolerance pairings.

Reconciliation

The independently measured strict-below-tolerance context count for 2020071190 is 11,445, confirming that separate prior. The measured two-current-endpoint count is 10,832, correcting the sourced 11,030 prior by 198. The determination records this inconsistency verbatim. Basin 2020003440 is measured without comparison to 4,309 or 4,368 because neither is a sourced prior for this classification.

Scope

The instrument deliberately omits orientation assignment, reverse-topological traversal, continuation past a production refusal, and the source-order condition at line 3871. No adapter behavior, version, schema, verdict, evidence input, or compiled basin output changed.