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physics: imp nodes get the MIDPOINT depth anchor between premises and conclusion

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Owner ruling (2026-09-30, live-testing loop — supersedes 02a58db's
exemption): implication nodes ARE depth-anchored after all. Their anchor
is the average of the HIGHEST premise row and the conclusion's row —
depth(imp) = (max(premise depths) + depth(conclusion)) / 2 — so the
junction always sits strictly above every premise and strictly below
the conclusion (a conclusion is >= highest premise + 1 in the logical
graph). Uniform across modes: a half-row in vertical, a ring midway in
radial (owner confirmed both).

Implementation:
- layout.ts: new ImpLink type; SimOptions/incrementalLayout gain
  impLinks (the derived chain linkage). The rank map is now computed
  once alongside the orphan mask: proposition ranks via Tarjan over the
  logical edges, then each supplied link adds its midpoint entry. An
  imp node WITH an anchor is structured (leaves the orphan mask —
  gravity projections treat it like any ranked node); WITHOUT supplied
  links, arg_ ids keep the legacy 02a58db exemption (honest fallback
  for callers that predate the field). The depth force reuses the
  precomputed map — one pass, shared.
- deriveView (core/graph.ts) emits impLinks (one per multi-premise
  live chain — single-premise chains mint no imp node); GraphSnapshot
  carries them; graph-view maps them into CanvasData; settleGraphLayout
  and replay-layout forward them (replay activates a junction's link
  exactly when its chain is delivered).

Tests (+3, 1 rewritten): the 02a58db exemption pin became the MIDPOINT
pin (premises row 0, conclusion row -500, junction pinned to -250);
mixed-depth pin (premises at 0 and 1, conclusion 2, junction at the 1.5
half-row — highest premise, not average-of-premises); legacy fallback
pin (no impLinks = never depth-anchored); deriveView impLinks emission
pin (multi-premise only). The horizontal-pole and ORPHAN RULE pins from
5554c3a survive unchanged — proposition orphans are untouched.
This commit is contained in:
amosblomqvist
2026-09-30 04:52:27 +03:00
parent 9f64019087
commit 35d8bc1a0c
9 changed files with 162 additions and 24 deletions
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src/core/contracts/graph.ts
+5
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@@ -319,6 +319,11 @@ export interface GraphSnapshot {
* depth pass consumes these — inference depth is a property of
* propositions, never of the geometry point (owner, 2026-09-30). */
logicalEdges: GraphEdge[];
/** DERIVED imp linkage (one per MULTI-premise live chain): the depth
* pass anchors each junction at the average of the highest premise
* row and the conclusion's row (owner, 2026-09-30) — strictly
* above the premises, strictly below the conclusion. */
impLinks: Array<{ id: string; premises: string[]; conclusion: string }>;
/** The STORED reasoning chains (merged by (premises, conclusion) at
* read): the chain table's and the practice pipeline's input — they
* read the truth, never the derived fan-out. */