ADR-0100 — Physics Reasoning-Capable Ratification

Status: Accepted Date: 2026-05-21 Accepted: 2026-05-22 Author: CORE agents + reviewers Depends on: ADR-0091, ADR-0092, ADR-0093, ADR-0096, ADR-0097

Acceptance evidence

Accepted after physics became a mechanically ratified reasoning-capable ledger row:

language_packs/data/en_physics_v1/manifest.json carries Domain Pack Contract v1 fields.
teaching/domain_chains/physics_chains_v1.jsonl supplies reviewed active chains.
tests/test_adr_0100_0102_sibling_ratifications.py pins:
- all nine predicates pass for en_physics_v1
- the ledger row status is reasoning-capable
- provenance points at adr-0100:reviewed:*
- expert_demo remains false
- claimed operators causal and modal meet chain coverage
- declared lanes include foundational_physics_ood, inference_closure, and fabrication_control

Context

The physics substrate is structurally complete:

language_packs/data/en_physics_v1/ ships with manifest, lexicon, glosses.
teaching/domain_chains/physics_chains_v1.jsonl exists.
evals/foundational_physics_ood/ exists with dev/public/holdout coverage.
docs/gaps.md marks physics gaps closed.
Chain coverage and intent-shape coverage satisfy ADR-0091 predicates.

This ADR applies the ADR-0097 ratification template to the physics domain.

Decision

Ratify en_physics_v1 as reasoning-capable under ADR-0091 by emitting the contract fields into its manifest and passing domain-contract validation.

Manifest additions

{
  "domain_contract_version": 1,
  "domain_id": "physics",
  "axioms": null,
  "rules": null,
  "teaching_chains": ["physics_chains_v1"],
  "eval_lanes": [
    {"lane": "foundational_physics_ood", "version": "v1", "splits": ["dev", "public", "holdout"]},
    {"lane": "inference_closure", "version": "v1", "splits": ["dev", "public", "holdout"]},
    {"lane": "fabrication_control", "version": "v1", "splits": ["dev", "public", "holdout"]}
  ],
  "reviewers": ["shay-j"],
  "known_gaps": [],
  "provenance": "adr-0100:reviewed:2026-05-21"
}

Claimed operator families: causal, modal. axioms and rules stay null at v1 — physics demonstrates reasoning through reviewed causal/modal chain composition, not declarative axioms.

What this ADR does not do

Does not introduce new lemmas, chains, or evals.
Does not promote to expert-demo.
Does not modify runtime mount behavior.

Invariant

physics_reasoning_capable_ledger_row — core capability ledger emits a row for domain_id: physics with status: reasoning-capable, provenance pointing at this ADR, and expert_demo: False until a future ADR attaches audit-tour-equivalent reports.

Lane

Existing lanes carry the evidence:

foundational_physics_ood/ — positive coverage
inference_closure/ — composition
fabrication_control/ — negative control
evals/domain_contract_validation/ — predicate validation

Consequences

Second ratified reasoning-capable domain.
Demonstrates the ADR-0091 contract is not math-only.
Provides an additional domain source for later showcase composition.

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