Adds compound-intent decomposition for prompts that ask multiple
things in one turn ("What is X, and why does it matter?",
"Explain X, but how does it work?", "What is X, and what is Y?").
Three landings in one PR (rule says additive; the three pieces
are inseparable for the runtime hook to do anything useful):
1. generate/intent.py
* New ``CompoundIntent`` frozen dataclass — ordered tuple of
``DialogueIntent`` parts + raw_text + ``.primary`` back-compat
accessor + ``.is_compound()`` helper.
* New ``classify_compound_intent(prompt)`` sibling to
``classify_intent``. Pure, deterministic, byte-stable. Splits
on closed connector list (``,\s+(and|but|because|while)\s+``);
anaphoric tails ("why does it matter") get the prior part's
subject substituted ("why does truth matter") then are
classified independently.
* ``classify_intent`` return shape is untouched — every existing
caller still receives ``DialogueIntent``.
* No new ``IntentTag`` introduced. v1 semantic approximation:
"why does X matter" routes to ``CAUSE(X)``; "matter" means
causal/relevance support, not metaphysical importance.
2. generate/discourse_planner.py
* New ``plan_compound_discourse(compound, mode, bundles)`` —
concatenates per-part sub-plans in source order with a
``TRANSITION`` bridge (fact=None) between consecutive parts.
No cross-part re-sorting.
* New private kw-only ``_exclude_facts`` parameter on
``plan_discourse`` so subsequent sub-plans can avoid emitting
the same facts the prior sub-plans already used (prevents
"Truth is X. Truth is X." duplicates on shared-subject
compounds). Public signature ``(intent, mode, bundle)`` is
unchanged.
3. chat/runtime.py
* Helper ``_maybe_apply_discourse_planner`` now consults the
compound classifier first. When the prompt is multi-part it
builds per-part bundles and calls ``plan_compound_discourse``;
otherwise it follows the previous single-intent path.
* Compound bypass: when upstream tagged the surface ``oov`` /
``none`` because the flat classifier saw a polluted subject
(e.g. ``"truth, and why does it matter"``), but the compound
decomposition reveals a pack-resident primary subject, the
planner engages on the decomposed parts. This narrowly widens
the gate exclusively for compound prompts with substrate.
* BRIEF mode upgrades to EXPLAIN for compound prompts —
single-anchor sub-plans on shared subjects would emit duplicate
anchor sentences in BRIEF.
* Return shape widened to ``tuple[str, str] | None`` —
``(rendered_surface, new_source_tag)``. ``new_source_tag`` is
``"teaching"`` when the plan uses any teaching fact, else
``"pack"`` — so downstream labels reflect actual provenance
even on the compound bypass. Both cold and warm call sites
updated to apply both fields.
24 new tests pin: compound decomposition correctness, source-order
preservation across sub-plans, anaphoric-followup rewriting,
deterministic byte-stable plans, no new IntentTag introduced,
fact-dedup across sub-plans, compound-bypass engagement, and
source-tag correction on planner-engaged surfaces.
Lane re-measurement after 3 compound cases added to cases.jsonl
(24 total cases):
flag off: articulate=0.0833, disclosure=0.1667, unarticulate=0.7500
flag on : articulate=0.9167, disclosure=0.0000, unarticulate=0.0833
Note: disclosure flag-on dropped to 0.0 because the source-tag
correction now correctly labels compound-bypass surfaces as
``pack/teaching`` instead of letting the upstream ``oov`` label
inflate disclosure. The two remaining unarticulate cases flag-on
are the walkthrough prompts targeted by the next landing.
Critical gates all green:
* flag off cognition byte-identical: public 100/100/91.7/100
* smoke suite 67/67
* 32/32 planner tests pass (helper + render + compound)
* 18/18 compound classifier tests pass
Pre-cleanup before extending intent classification. Extracts
``ChatRuntime._maybe_apply_discourse_planner(text, source_tag) ->
str | None`` and replaces the two duplicated blocks (cold-start
pack-grounded branch + warm post-walk branch) with single-line
``planned = ...; if planned is not None: assign`` call sites.
Signature locked: takes only the prompt and the already-classified
grounding source tag; returns the replacement surface or None.
Callers own assignment — the helper neither reads nor writes any
surface or articulation state. The warm site additionally does the
``articulation = replace(articulation, surface=planned)`` follow-up
which the cold site does not need.
Gating discipline unchanged (re-pinned in 9 new tests):
* Returns None when ``self.config.discourse_planner`` is False.
* Returns None unless source_tag ∈ {"pack", "teaching"}.
* Returns None when the classified intent has no subject.
* Returns None on single-move plans (BRIEF mode / empty bundle).
* Returns None on empty rendered string.
Behavior is byte-identical to the pre-dedup state — same metrics:
flag off: multi=0.1429, primed_multi=0.0000, conn=0.0769
flag on : multi=0.5238, primed_multi=0.5000, conn=0.2308
cognition eval byte-identical: public 100/100/91.7/100.
smoke suite 67/67.
The two paths now cannot drift; the upcoming intent classifier
extension lifts both branches in lockstep.
Shay