D-GSO-7: reasoning-band earning and downgrade (P7)

.claude/board/STATUS_BOARD.md

@@ -32,8 +32,8 @@ Plan: `.claude/plans/2026-10-06-global-sudoku-replayable-orchestration-v1.md`. O
 | **D-GSO-3** | P3: global ontology agreement/disagreement probe (mammal fixture) | Shipped (#1350) | `cognitive-shader-driver/examples/ontology_agreement_probe.rs`: `NiblePath` hierarchy + `ontology_warrant::Quorum`/`SourceVerdict` folded per observation into local (self + siblings), up (ancestors), down (descendants); binary-entropy tension; all four cells + unknown reached; 6 tests, 5 disable runs red |
 | **D-GSO-4** | P4: entropy × topology routing probe | Shipped (#1351) | `cognitive-shader-driver/examples/entropy_topology_probe.rs` = F-ECG-1 and F-ECG-2 at probe level (F-ECG-3 open: no real corpus carries topology bits yet): bits 59..60 read through `BandDeclarations::project_truth` (topology lens, asserted provenance), known-share census as competence, `SettlementSignals::cell`, §4b walker route; equal measured entropy (0.8167 bits) → Crystal vs Glass; 6 tests, 4 disable runs red |
 | **D-GSO-5** | P5: first recipe quartet over existing primitives | Shipped (#1355) | `cognitive-shader-driver/examples/recipe_quartet_probe.rs`: four `match`-arm recipes over `Quorum::observe`, `Quad8::fold_product`, `Morton8x8` + `PalettePerturbation::hop`, `GadamerRevision::revise` (verdict left `NotRun`: removing the new roots is tautological, so the counterfactual moves to P7); a thread-local counting allocator shows zero allocations per recipe (no instruction vector); `ProbeRecipe` is its own type, not a shipped `recipes` ID; ordinal meanings not canonized; no Pearl projection (P7) and no selector (P6); 7 tests, 6 disable runs red |
-| **D-GSO-6** | P6: deterministic, versioned recipe selector | In PR | `cognitive-shader-driver/examples/recipe_selector_probe.rs`: `SelectorPolicy::select(state)` is a pure `const fn` over a declared 4-fact `EpistemicState`; V1 = §11 order (fold, bound, local, revise), rests only on the settled state; V2 swaps two steps (differs on 2 of 16 states); a recorded `Selection` (policy + state) replays under its own policy; every cycle rests in one step per open condition and replays identically; the version covers selection only, not recipe implementations (§13 digest open); 5 tests, 5 disable runs red |
-| **D-GSO-7** | P7: reasoning-band earning and downgrade | Queued | association cannot skip to causal permission; contradicting evidence lowers it; replayable |
+| **D-GSO-6** | P6: deterministic, versioned recipe selector | Shipped (#1358) | `cognitive-shader-driver/examples/recipe_selector_probe.rs`: `SelectorPolicy::select(state)` is a pure `const fn` over a declared 4-fact `EpistemicState`; V1 = §11 order (fold, bound, local, revise), rests only on the settled state; V2 swaps two steps (differs on 2 of 16 states); a recorded `Selection` (policy + state) replays under its own policy; every cycle rests in one step per open condition and replays identically; the version covers selection only, not recipe implementations (§13 digest open); 5 tests, 5 disable runs red |
+| **D-GSO-7** | P7: reasoning-band earning and downgrade | In PR | `cognitive-shader-driver/examples/reasoning_band_probe.rs`: `ReasoningBand` (bits 61..63) read only via `band_reading::project_band`; earned one rung per executed passing proof under the shipped Pearl `CausalMask` (SO majority → Association, PO intervention trial passed → Causal, SPO removal attack passed → Counterfactual), outcomes executed from trial data and never supplied, no skipping, `NotRun` never raises; failed test, contradicting `Quorum` (minority caps at Association, majority drops to Surface) and `simpsons_paradox_risk` lower it; replay gives the same edge bits; unreadable provenance / undeclared / band-absent refuse; ladder and thresholds are policy pins; 7 tests, 10 disable runs red |
 | **D-GSO-8** | P8: seal boundary | Queued | replay from the prior seal reproduces the next seal |
 
 ## D-PLX — Population-law cross-check (2026-10-03)

crates/cognitive-shader-driver/Cargo.toml

@@ -73,6 +73,11 @@ test = true
 name = "recipe_selector_probe"
 test = true
 
+# D-GSO-7 reasoning-band probe; tests run under `cargo test`.
+[[example]]
+name = "reasoning_band_probe"
+test = true
+
 [dependencies]
 lance-graph-contract = { path = "../lance-graph-contract" }
 # Read-only ontology registry (Phase 7, v4 plan). default-features = false so the

crates/cognitive-shader-driver/examples/README.md

@@ -158,3 +158,21 @@ version covers selection only, not the recipes' implementations (plan §13).
 ```bash
 cargo run -p cognitive-shader-driver --example recipe_selector_probe
 ```
+
+## reasoning_band_probe.rs
+
+D-GSO-7 (plan §18 P7). The `ReasoningBand` on a `CausalEdge64` (bits 61..63,
+read only through `band_reading::project_band`) is earned one rung per executed,
+passing proof: an `SO` observation a majority corroborates gives `Association`,
+a passed `PO` intervention on top of it gives `Causal`, a passed `SPO`
+counterfactual on top of that gives `Counterfactual`. Observations never lift
+past `Association`, a test that was not run never raises, and no rung is
+skipped. A pass is never supplied: events carry trial data (intervention
+counts, a removal attack on premise masks) and the probe executes the trial to
+derive the outcome. A failed test, contradicting independent evidence (`Quorum`) or
+confounding (`CausalMask::simpsons_paradox_risk`) lowers the band, and the same
+events replay to the same edge bits. The ladder and thresholds are policy pins.
+
+```bash
+cargo run -p cognitive-shader-driver --example reasoning_band_probe
+```