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
Asymmetric counterpart to cold_start_grounding. Builds the
measurement substrate for the Phase B1 pipeline-override usefulness
gate. Lane is committed now (red baseline measured) so the fix is
landed against a fixed regression target.
The 2026-05-19 design review surfaced the bug this lane catches:
> pipeline overrode a runtime surface with a placeholder realizer
> surface because realized_plan.surface was non-empty, even though
> it contained '...'. The runtime audit log still held a different
> surface. This is the central fluency/design fault: the system
> can be "green" while user-facing selection, pipeline selection,
> and telemetry selection disagree.
The lane reproduces this exactly on the current main:
Surface "Soon is defined as ..." emitted on turn 2 of "What does
soon mean?" (where turn 1 grounded as pack correctly). Telemetry
recorded a different surface than the pipeline returned.
Initial red baseline (THIS commit):
no_placeholder_rate = 0.4444 (target after Phase B1: 1.00)
telemetry_consistency_rate = 0.4444 (target after Phase B1: 1.00)
warm_grounding_stability = 0.0000 (target after Phase B1: >=0.95)
Cold-start-grounding stays at 1.00 on its own metrics. The cold lane
measures routing, the warmed lane measures override discipline; they
are deliberately not the same.
Files:
evals/warmed_session_consistency/contract.md
What is measured, why, and the asymmetry with cold_start_grounding.
Documents the four binary per-turn signals (no_placeholder,
pipeline_match_telemetry, pipeline_match_walk, grounded_holds_on_warm)
and the per-case warm_grounding_stable invariant.
evals/warmed_session_consistency/public/v1/cases.jsonl
8 cases / 18 turns. Mix of:
- replay-the-same-prompt (catches override drift)
- mixed-intent sequences (catches OOV / pack interaction)
- cause-no-chain (must stay none across replays)
- what-does-x-mean (the warmed variant of the cold-start test)
evals/warmed_session_consistency/dev/cases.jsonl
2 representative cases for fast iteration.
evals/warmed_session_consistency/runner.py
Framework-compliant run_lane(cases, config=None) -> LaneReport.
Constructs ONE ChatRuntime + CognitiveTurnPipeline per case,
plays the turn sequence through them. Per-turn signals:
no_placeholder — surface free of ..., <pending>, <prior>
telemetry_match — pipeline result.surface == turn_log[-1].surface
grounding_match — actual_grounding == expected_grounding
Per-case signal:
warm_grounding_stable — every replayed prompt produces the same
grounding across turns
tests/test_warmed_session_lane.py
8 contract tests covering: case-set integrity, replay-pattern
presence, lane discovery, runner emits every required metric,
per-turn details carry all signals, and the warmed-runtime
invariant (static check that ChatRuntime is constructed
per-case, not per-turn and not module-scope).
NOT pinned in this commit (deliberate):
Threshold assertions are NOT in the test file. They will land in
Phase B1 alongside the pipeline-override usefulness gate. This
lane's role at present is to PROVIDE the regression target, not
to enforce it before the fix.
Verification: 8/8 lane tests green; the lane itself runs and emits
the red metrics documented above.
Shay