Sharpens the measurement layer to match the runtime spine landed in
07fefb9 / 7af7892 / 4e3ddee. Pure eval/benchmark/holdout work —
no runtime or planner code changed.
New isolation lanes
-------------------
* ``evals/compound_intent_decomposition/`` — single-purpose lane for
the new ``classify_compound_intent`` decomposer. Metrics:
``decomposition_accuracy``, ``atom_precision``, ``subject_accuracy``.
Public: ``decomposition=1.0`` on 4e3ddee.
* ``evals/walkthrough_chain/`` — single-purpose lane for the new
WALKTHROUGH sequential teaching-chain walk. Metrics:
``path_exact_rate``, ``anchor_rate``, ``min_hop_rate``, ``bounded_rate``.
Public: ``path_exact=1.0`` on 4e3ddee.
Without these, regressions in compound decomposition or the
walkthrough walk would show up as noise in ``multi_sentence_response``.
Each capability now has a single load-bearing metric on its own lane.
Cold-start lane sharpened
-------------------------
* ``evals/cold_start_grounding/public/v1/cases.jsonl`` extended with
expository, compound, and walkthrough cases (48 total cases across
19 categories including new ``expository_definition``,
``compound_definition_cause``, ``walkthrough_definition``).
* ``evals/cold_start_grounding/runner.py`` uses
``classify_compound_intent(...).primary`` for compound subject
scoring — previously misattributed subjects on multi-part prompts.
Holdouts for the long-span lanes
--------------------------------
Until now only the cognition lane had a holdout split. Adding
holdouts to the long-span lanes gives the planner work somewhere to
fail honestly when we widen:
* ``evals/cold_start_grounding/holdouts/v1/cases.jsonl`` (5 cases)
* ``evals/multi_sentence_response/holdouts/v1/cases.jsonl`` (5 cases)
* ``evals/conversational_thread_coherence/holdouts/v1/cases.jsonl`` (3 cases)
* ``evals/warmed_session_consistency/holdouts/v1/cases.jsonl`` (2 cases)
Discourse-planner-on bench sub-bench
------------------------------------
* ``benchmarks/articulation.py`` adds a planner-on sub-bench that
reports ``articulate_sentence_rate`` alongside the existing
throughput metrics. Baselines articulation under load before any
follow-up touches ``compute_trace_hash``.
Test coverage
-------------
* ``tests/test_compound_walkthrough_eval_lanes.py`` — new file pinning
the two new lane runners.
* ``tests/test_articulation_bench.py``, ``tests/test_cold_start_grounding_lane.py``,
``tests/test_intent_explain_paragraph.py``,
``tests/test_response_mode_classifier.py`` — updated for new cases
and assertions.
Validation
----------
* 152/152 active tests pass on the listed surfaces (2 skipped).
* smoke suite 67/67.
* cognition eval byte-identical: public 100/100/91.7/100.
* multi_sentence flag_on: articulate=1.0, disclosure=0.0, unarticulate=0.0
* compound_intent_decomp public: decomposition=1.0
* walkthrough_chain public: path_exact=1.0
* cold_start_grounding public (48 cases): intent=1.0, grounding=1.0, subject=1.0
Commits the 2026-05-19 probe as a durable, replayable eval lane.
This is *step 1* of the gloss-feature rollout sequence agreed
upstream: establish a stable measurement substrate before any
further intent/grounding changes, so the 52%→0% lift (and any
future regression) is reproducible and CI-pinned.
The lane is deliberately named ``cold_start_grounding`` rather than
``fluency``:
- It measures **routing** (intent → grounding source), not
sentence quality, morphology, or surface diversity.
- The cold-start qualifier reflects the fresh-``ChatRuntime()``-
per-case design. Re-using a runtime across cases would
contaminate the vault from earlier turns and was the exact bug
observed during the probe before the per-case-runtime fix.
Files:
evals/cold_start_grounding/contract.md
Lane contract: what is measured, scoring rubric, pass thresholds
(intent ≥ 0.95 / grounding ≥ 0.95 / subject ≥ 0.90), and the
rationale for the deliberate non-fallback on CAUSE/VERIFICATION
without teaching chains.
evals/cold_start_grounding/public/v1/cases.jsonl
44 cases across 16 categories. Each case carries id, prompt,
category, expected_intent, expected_grounding_source, and an
optional expected_subject. Categories cover every intent
pattern fixed in b52e04a (Define, What-does-X-mean, infinitive,
How-does-X-work, What-causes-X) plus OOV controls and CAUSE
cases with/without teaching chains.
evals/cold_start_grounding/dev/cases.jsonl
5 representative cases for fast local iteration.
evals/cold_start_grounding/runner.py
Framework-compliant ``run_lane(cases, config=None) -> LaneReport``.
Constructs a fresh ChatRuntime() inside ``_run_case`` (cold-start
invariant). Emits intent_accuracy, grounding_accuracy,
subject_accuracy, full grounding distributions, and a per-
category breakdown for regression attribution.
tests/test_cold_start_grounding_lane.py
16 contract tests covering: case-set integrity, valid enum
values, unique ids, lane discovery, pass thresholds, expected-
vs-actual distribution match (drift detection), the architectural
invariants on oov_control and cause_no_teaching_chain cases, the
cold-start invariant (static check that the runner constructs
ChatRuntime() inside the per-case helper, not at module scope),
and result JSON-serialization round-trip.
Baseline metrics (this commit, all v1 public cases):
intent_accuracy: 1.0000 (44/44)
grounding_accuracy: 1.0000 (44/44)
subject_accuracy: 1.0000 (44/44)
grounding distribution (actual == expected exactly):
pack: 37
oov: 4
teaching: 1
none: 2 (deliberate — CAUSE without teaching chain)
Why "none" cases are *expected* to ground as none:
CAUSE / VERIFICATION on a pack-resident lemma WITHOUT an active
teaching chain stays grounding_source='none' on purpose. Falling
through to pack_grounded_surface here would mask the discovery-
candidate signal the teaching pipeline uses to identify chains
worth authoring. The contract test in
TestArchitecturalInvariants::test_cause_no_chain_cases_route_to_none
pins this doctrine.
Verification: 16/16 lane tests green; full lane run via
``core eval cold_start_grounding`` reports 100% on every metric.
Subsequent steps in the agreed sequence (NOT in this commit):
2. Hygiene: runtime API wrappers (achat/arespond/respond) + the
stale CAUSE/VERIFICATION docstring in
tests/test_intent_classification_extensions.py.
3. Harden gloss resolver in feat/pack-glosses-wip
(lexicon-residency check, dual checksum, cache clearing,
malformed-JSONL skip tests).
4. Wire gloss-backed pack_grounded_surface().
5. Author starter glosses with checksum discipline.
Shay