fieldtest: milestone verb-dissolution — 3 scenarios, 8 findings

Milestone-close fieldtest for "Verb dissolution" (#210), authored from the
public interface only. Three end-to-end scenarios over the real GER40/USDJPY
2025 archive:
  1. all four dissolved verbs on the r-sma real path (sweep via blueprint;
     generalize/walkforward/mc via --strategy) — correct + deterministic;
  2. reach-through — `aura generalize` auto-registers a campaign+process
     document and `aura campaign run <id>` reproduces worst_case byte-for-byte;
  3. a hand-authored 2-instrument × 2-window × 2-regime matrix (8 cells → 4
     generalizations) no verb can express — regimes compared, never argmax'd.

Result: 0 bugs; the core promise holds empirically (behaviour preservation,
campaign-substrate reach-through, and the risk-regime axis all confirmed).
Residual findings are discoverability/ergonomics follow-ups, filed as #216
(risk-axis discoverability), #217 (verb knob asymmetry), #218 (no-project
store litter). The friction-and-bug spec stays a git-ignored working file.

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fieldtests/milestone-verb-dissolution/mvd_3_campaign_regime_matrix.json

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+      "ref": { "content_id": "546f4838aca6b0bf67140b5868b4aba18fdc53be57e6cca28bf23588fbf68027" },
+      "axes": {
+        "fast.length": { "kind": "I64", "values": [3, 5] },
+        "slow.length": { "kind": "I64", "values": [12, 20] }
+      }
+    }
+  ],
+  "process": { "ref": { "content_id": "d68e747465a7e0ccde2fc1ea425119bd2f2bc26c43a3001a71c7ee0b6ac6a901" } },
+  "presentation": { "persist_taps": [], "emit": ["family_table", "selection_report"] }
+}

fieldtests/milestone-verb-dissolution/mvd_3_process_sweep_generalize.json

@@ -0,0 +1,10 @@
+{
+  "format_version": 1,
+  "kind": "process",
+  "name": "mvd-sweep-deflate-generalize",
+  "description": "Anti-false-discovery sweep (deflated argmax) then a cross-instrument worst-case floor, run once per (window, risk regime) cell.",
+  "pipeline": [
+    { "block": "std::sweep", "metric": "sqn_normalized", "select": "argmax", "deflate": true },
+    { "block": "std::generalize", "metric": "expectancy_r" }
+  ]
+}

fieldtests/milestone-verb-dissolution/mvd_bare.json

@@ -0,0 +1 @@
+{}

fieldtests/milestone-verb-dissolution/mvd_lab/.gitignore

@@ -0,0 +1,3 @@
+/target
+Cargo.lock
+/runs

fieldtests/milestone-verb-dissolution/mvd_lab/Aura.toml

@@ -0,0 +1,4 @@
+# Static project context only (C17); paths only.
+[paths]
+runs = "runs"
+# data = "/path/to/archive"  # the recorded-data root; defaults to the built-in path

fieldtests/milestone-verb-dissolution/mvd_lab/CLAUDE.md

@@ -0,0 +1,10 @@
+# mvd_lab — an aura research project
+
+This crate is an aura project: a cdylib of node/strategy blueprints the
+`aura` host loads during research (see the engine's docs/project-layout.md).
+
+- Build: `cargo build` (the next `aura` invocation loads the fresh dylib)
+- Run:   `aura run blueprints/signal.json` (from anywhere inside this dir)
+- Nodes live in `src/`; each is registered in `vocabulary()`/`type_ids()`
+  under the `mvd_lab::` namespace prefix.
+- Topology is data (`blueprints/*.json`), node logic is Rust.

fieldtests/milestone-verb-dissolution/mvd_lab/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "mvd_lab"
+version = "0.1.0"
+edition = "2024"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+aura-core = { path = "/home/brummel/dev/aura/crates/aura-core" }
+
+# Standalone workspace root: never a member of an enclosing workspace.
+[workspace]

fieldtests/milestone-verb-dissolution/mvd_lab/blueprints/signal.json

@@ -0,0 +1 @@
+{"format_version":1,"blueprint":{"name":"mvd_lab_signal","nodes":[{"primitive":{"type":"SMA","name":"fast","bound":[{"pos":0,"name":"length","kind":"I64","value":{"I64":2}}]}},{"primitive":{"type":"SMA","name":"slow","bound":[{"pos":0,"name":"length","kind":"I64","value":{"I64":4}}]}},{"primitive":{"type":"Sub"}},{"primitive":{"type":"Bias","name":"bias","bound":[{"pos":0,"name":"scale","kind":"F64","value":{"F64":0.5}}]}},{"primitive":{"type":"mvd_lab::Identity"}}],"edges":[{"from":0,"to":2,"slot":0,"from_field":0},{"from":1,"to":2,"slot":1,"from_field":0},{"from":2,"to":3,"slot":0,"from_field":0},{"from":3,"to":4,"slot":0,"from_field":0}],"input_roles":[{"name":"price","targets":[{"node":0,"slot":0},{"node":1,"slot":0}],"source":"F64"}],"output":[{"node":4,"field":0,"name":"bias"}]}}

fieldtests/milestone-verb-dissolution/mvd_lab/src/lib.rs

@@ -0,0 +1,76 @@
+//! mvd_lab — an aura research project: node logic + the exported vocabulary.
+//!
+//! Every node type this crate provides is registered in `vocabulary()` /
+//! `type_ids()` under the `mvd_lab::` namespace prefix; the `aura` host loads
+//! this cdylib per invocation and merges it with the std vocabulary.
+
+use aura_core::{
+    Cell, Ctx, FieldSpec, Firing, Node, NodeSchema, PortSpec, PrimitiveBuilder,
+    ScalarKind,
+};
+
+/// One-input f64 pass-through. Emits `None` until its input has a value.
+pub struct Identity {
+    out: [Cell; 1],
+}
+
+impl Identity {
+    pub fn new() -> Self {
+        Self { out: [Cell::from_f64(0.0)] }
+    }
+    pub fn builder() -> PrimitiveBuilder {
+        PrimitiveBuilder::new(
+            "mvd_lab::Identity",
+            NodeSchema {
+                inputs: vec![PortSpec {
+                    kind: ScalarKind::F64,
+                    firing: Firing::Any,
+                    name: "value".into(),
+                }],
+                output: vec![FieldSpec { name: "value".into(), kind: ScalarKind::F64 }],
+                params: vec![],
+            },
+            |_| Box::new(Identity::new()),
+        )
+    }
+}
+
+impl Default for Identity {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Node for Identity {
+    fn lookbacks(&self) -> Vec<usize> {
+        vec![1]
+    }
+    fn eval(&mut self, ctx: Ctx<'_>) -> Option<&[Cell]> {
+        let w = ctx.f64_in(0);
+        if w.is_empty() {
+            return None;
+        }
+        self.out[0] = Cell::from_f64(w[0]);
+        Some(&self.out)
+    }
+    fn label(&self) -> String {
+        "mvd_lab::Identity".to_string()
+    }
+}
+
+fn vocabulary(type_id: &str) -> Option<PrimitiveBuilder> {
+    match type_id {
+        "mvd_lab::Identity" => Some(Identity::builder()),
+        _ => None,
+    }
+}
+
+fn type_ids() -> &'static [&'static str] {
+    &["mvd_lab::Identity"]
+}
+
+aura_core::aura_project! {
+    namespace: "mvd_lab",
+    vocabulary: vocabulary,
+    type_ids: type_ids,
+}

fieldtests/milestone-verb-dissolution/mvd_sweep_smacross_blueprint.json

@@ -0,0 +1 @@
+{"format_version":1,"blueprint":{"name":"graph","nodes":[{"primitive":{"type":"SMA","name":"fast"}},{"primitive":{"type":"SMA","name":"slow"}},{"primitive":{"type":"Sub","name":"sub"}},{"primitive":{"type":"Bias","name":"bias"}}],"edges":[{"from":0,"to":2,"slot":0,"from_field":0},{"from":1,"to":2,"slot":1,"from_field":0},{"from":2,"to":3,"slot":0,"from_field":0}],"input_roles":[{"name":"price","targets":[{"node":0,"slot":0},{"node":1,"slot":0}],"source":"F64"}],"output":[{"node":3,"field":0,"name":"bias"}]}}

fieldtests/milestone-verb-dissolution/mvd_sweep_smacross_op.json

@@ -0,0 +1,12 @@
+[
+  {"op": "source", "role": "price", "kind": "F64"},
+  {"op": "add", "type": "SMA", "name": "fast"},
+  {"op": "add", "type": "SMA", "name": "slow"},
+  {"op": "feed", "role": "price", "into": ["fast.series", "slow.series"]},
+  {"op": "add", "type": "Sub", "name": "sub"},
+  {"op": "connect", "from": "fast.value", "to": "sub.lhs"},
+  {"op": "connect", "from": "slow.value", "to": "sub.rhs"},
+  {"op": "add", "type": "Bias", "name": "bias"},
+  {"op": "connect", "from": "sub.value", "to": "bias.signal"},
+  {"op": "expose", "from": "bias.bias", "as": "bias"}
+]