Closes audit Finding 2 (2026-05-20) — Phase B substrate.
Pre-fix ``CognitiveTurnPipeline.run()`` invoked ``realize_semantic``
on the ungrounded ``PropositionGraph``. Every non-COMPARISON /
non-CORRECTION node was born with ``obj = "<pending>"`` and the
realizer emitted surfaces like ``"X is defined as ..."`` that
``_is_useful_surface`` correctly rejected. The realizer therefore
never won the surface resolver introduced by PR #76 — it was
structurally present but semantically inert in the hot pipeline
path.
This PR follows the codebase's standard substantive-change pattern
(ADR-0046 ``forward_graph_constraint``, ADR-0062 ``composed_surface``,
ADR-0083 ``transitive_surface``, ADR-0085 ``gloss_aware_cause``):
ship the wiring behind a flag, default ``False``, with a CI-pinned
null-lift invariant.
Changes:
* ``RuntimeConfig.realizer_grounded_authority: bool = False`` —
operator-level opt-in.
* ``ChatResponse.recalled_words: tuple[str, ...] = ()`` —
alphabetic-filtered walk tokens from the recall step, populated
on the main path of ``ChatRuntime._chat``. ``walk_tokens`` is
now computed unconditionally so non-English packs also surface
them (English keeps using them for
``articulate_with_intent`` as before).
* ``CognitiveTurnPipeline.run()`` — when the flag is set and the
response carries any recalled words, calls
``ground_graph(graph, response.recalled_words)`` and re-invokes
``realize_semantic`` on the grounded graph. The surface
resolver (PR #76) then picks the realizer's grounded output
when it clears ``_is_useful_surface`` and the unknown-domain
gate did not fire.
Phase A (realizer fluency parity — gloss-aware templates, 3sg verb
agreement, pack-provenance tag) is documented in ADR-0088 §Phase A
and is the prerequisite for enabling this flag in production. The
known fluency gap (e.g. ``"Light is a visible medium that reveal
truth"`` — subject-verb disagreement leaking from realizer
templates) is the reason the flag ships default-off: operators get
the wiring stable now, the realizer becomes a real authority once
Phase A's fluency upgrade lands.
Verification:
* 4 new tests in ``tests/test_realizer_grounded_authority_flag.py``:
- flag defaults to ``False`` on ``DEFAULT_CONFIG``
- flag-off produces byte-identical surface + trace_hash
(null-lift invariant)
- ``recalled_words`` is populated on the main path
- flag-on runs end-to-end without crashing (surface is
well-formed regardless of which authority won the resolver)
* ``core eval cognition`` — public 100/100/91.7/100,
byte-identical to the MEMORY baseline (default-off).
* ``core test --suite cognition`` — 120/0/1.
* ``core test --suite smoke`` — 67/0.
* ``core test --suite runtime`` — 19/0.
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