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feat(trust): wire diminishment detection into the credibility pass #36

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hugooconnor commented 2026-07-17 11:56:07 +00:00 (Migrated from codeberg.org)
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Wires defeated-defeater detection and diminishment into compute_weighted_conclusions, populating the previously unused WeightedConclusion::diminished_by.

Semantics

A defeater diminishes a +d conclusion when its head complements the conclusion's literal and its body is positively provable (it fired). Since the conclusion is nonetheless positive, the proof theory guarantees the defeater was overruled by the superiority relation, so no separate superiority check is needed. Defeaters whose antecedents are not provable mount no challenge and do not diminish.

Defeater credibility is the weakest link of its own derivation (build_trust_tree); degrees fold as degree * (1 - defeater_degree) per defeater in rule order, matching the Lean-verified diminish_all. Thresholds evaluate on the post-diminishment degree. +D conclusions are exempt: a strict conclusion cannot be challenged by a defeater.

Tests

Six new integration tests in trust_integration_tests.rs:

  • The COMMA 2026 SLA example end-to-end for all three parties: plaintiff 0.63, defendant 0.04, court 0.30
  • Unfired defeaters do not diminish
  • Two defeaters fold multiplicatively (0.9 x 0.5 x 0.8 = 0.36)
  • +D conclusions are not diminished

Full workspace: 2083 passed, 0 failed. Verified end-to-end via spindle reason --trust --json.

🤖 Generated with Claude Code

Wires defeated-defeater detection and diminishment into `compute_weighted_conclusions`, populating the previously unused `WeightedConclusion::diminished_by`. ## Semantics A defeater diminishes a `+d` conclusion when its head complements the conclusion's literal and its body is positively provable (it *fired*). Since the conclusion is nonetheless positive, the proof theory guarantees the defeater was overruled by the superiority relation, so no separate superiority check is needed. Defeaters whose antecedents are not provable mount no challenge and do not diminish. Defeater credibility is the weakest link of its own derivation (`build_trust_tree`); degrees fold as `degree * (1 - defeater_degree)` per defeater in rule order, matching the Lean-verified `diminish_all`. Thresholds evaluate on the post-diminishment degree. `+D` conclusions are exempt: a strict conclusion cannot be challenged by a defeater. ## Tests Six new integration tests in `trust_integration_tests.rs`: - The COMMA 2026 SLA example end-to-end for all three parties: plaintiff 0.63, defendant 0.04, court 0.30 - Unfired defeaters do not diminish - Two defeaters fold multiplicatively (0.9 x 0.5 x 0.8 = 0.36) - `+D` conclusions are not diminished Full workspace: 2083 passed, 0 failed. Verified end-to-end via `spindle reason --trust --json`. 🤖 Generated with [Claude Code](https://claude.com/claude-code)
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