Closes audit Findings 6 (within-turn recall not batched) and 7
(probe-ingest / commit-ingest dual field) as a single PR — the two
are architecturally entangled and resolve together.
Pre-fix flow in ``ChatRuntime.chat()``:
1. ``probe_ingest(filtered)`` → ``probe_state.F``
2. Gate check on ``probe_state.F``
3. If gate fires: ``commit_ingest`` + stub response
4. Otherwise: ``commit_ingest`` + drive bias → ``field_state.F``
5. Walk runs on ``field_state.F``
The gate observes one manifold position; the walk navigates a
slightly different one (drive bias applied between them). Honest
refusal decisions and walk outputs are made on different fields —
the audit's named coherence gap.
This PR ships a flag-gated unified-ingest path following the
codebase's standard substantive-change pattern (ADR-0046 /
ADR-0062 / ADR-0085 / ADR-0088 / ADR-0089):
``RuntimeConfig.unified_ingest: bool = False`` (default).
When ``True``:
1. ``commit_ingest(filtered)`` runs first.
2. Drive bias applied immediately.
3. Gate observes ``committed.F``.
4. If gate fires: stub response (turn has already committed —
intentional semantic change documented in ADR-0090).
5. Otherwise: walk runs on the same ``committed.F`` the gate
decided against — no second ``commit_ingest`` call.
6. ``probe_ingest`` is not called on this path.
When ``False`` (default): historical behavior is preserved
bit-for-bit; ``probe_ingest`` still runs first.
ADR-0090 documents:
* Phase 1 (this PR): unified-ingest substrate.
* Phase 2 (separate PR, after Phase 1 validates): batched recall
— pass the gate's ``direct_hits`` into ``generate()`` as a
``prebuilt_first_recall`` so the walk's first step does not
re-call ``vault.recall()`` on the same field. Single recall
call eliminated per turn.
* Out of scope: ``recall_batch`` for per-step walk recalls
(each step's query depends on the previous step's field
state; not batchable without changing walk geometry).
Validation:
* 5 new tests in ``tests/test_unified_ingest_null_lift.py``:
- flag defaults to ``False`` on ``DEFAULT_CONFIG``
- flag-off surface + trace_hash + vault_hits byte-identical
- flag-on does not call ``probe_ingest`` (verified via spy)
- flag-on produces well-formed surface + trace_hash
- flag-off still calls ``probe_ingest`` (historical guard)
* ``core eval cognition`` byte-identical across all three splits:
public 100/100/91.7/100, dev 100/100/78.6/100, holdout
100/100/83.3/100.
* ``core test --suite cognition`` 120/0/1, ``smoke`` 67/0,
``runtime`` 19/0.
Comb-pass status after this PR:
* Item 4 (graph topo) ✓ #92
* Item 5 (realizer node_map) ✓ #91
* Item 6 (batch recall) ✓ ADR-0090 substrate (this PR); Phase 2
optimization is queued
* Item 7 (probe/commit dual ingest) ✓ ADR-0090 (this PR)
* Item 8 (dead defensiveness sweep) ✓ #91
* Item 9 (local imports) ✓ #91
* Item 11 (dead ``_fold_compose_into_surface``) ✓ #91
* Item 13 (``_serialize_*`` fold) ✓ #91
* Item 15 (GenerationResult tuple/list) ⊘ false positive
* Item 16 (subject normalization consistency) ✓ #93
* Item 17 (redundant ``^`` anchors) ✓ #94
* Tier 5 minor (``_BE_FORMS`` hoist, walrus, reverse-iter) ✓ #94
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