fieldtest: executor-throughput complex (#268/#276/#277) — 5 examples, 7 findings

Downstream-consumer fieldtest over the public surface at the close of the
maximize-throughput complex: a 4-instrument campaign authored, validated,
run and read back through the normal verbs; determinism probed across
--parallel-instruments 1/2/4/10 and a same-K repeat (byte-identical modulo
the run-counter suffix); duplicate-instrument refusal and faulted-cell
isolation (exit 3, healthy cells persist) confirmed under the parallel
loop. 5 working, 0 bugs, 1 friction (the zero-bound diagnostic leaks
clap's NonZeroUsize wording), 1 spec_gap (gate-emptied cell exit semantics
undocumented) — both resolved in the follow-up tidy.

refs #277

fieldtests/cycle-277-parallel-cell-loop/lab/.gitignore

@@ -0,0 +1 @@
+/runs

fieldtests/cycle-277-parallel-cell-loop/lab/Aura.toml

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+# 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/cycle-277-parallel-cell-loop/lab/CLAUDE.md

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+# lab — an aura research project (data-only)
+
+This directory is an aura project: blueprints + research documents over the
+std vocabulary, anchored by `Aura.toml`. There is no crate and no build step.
+
+- Run:   `aura run blueprints/signal.json` (the starter is closed — all
+  params bound; bound values are defaults — any `--axis` may override them
+  (#246))
+- Sweep: `aura sweep blueprints/signal.json --axis lab_signal.fast.length=2,4,8`
+  (`aura sweep <bp> --list-axes` lists the open + bound-overridable axes)
+- Native nodes: when the project needs its first project-specific node,
+  `aura nodes new <name>` scaffolds a node crate beside this project and
+  attaches it via `[nodes]` in `Aura.toml` (build it with `cargo build`).
+- Topology is data (`blueprints/*.json`); results land in `runs/`.

fieldtests/cycle-277-parallel-cell-loop/lab/blueprints/signal.json

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+{"format_version":1,"blueprint":{"name":"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}}]}}],"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/cycle-277-parallel-cell-loop/p277_1_campaign_multi.json

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+{
+  "format_version": 1,
+  "kind": "campaign",
+  "name": "p277-four-instrument-smacross",
+  "seed": 42,
+  "data": {
+    "instruments": ["GER40", "FRA40", "US500", "EURUSD"],
+    "windows": [ { "from_ms": 1725148800000, "to_ms": 1727740800000 } ]
+  },
+  "strategies": [
+    {
+      "ref": { "content_id": "597d719b7ac607158cda3e68cd497387620397a5e93087e23da512876dafba9a" },
+      "axes": {
+        "fast.length": { "kind": "I64", "values": [2, 4] },
+        "slow.length": { "kind": "I64", "values": [8, 16] },
+        "bias.scale": { "kind": "F64", "values": [0.5] }
+      }
+    }
+  ],
+  "process": { "ref": { "content_id": "1733ead3e5d83e4d1bee329bd0d897175b23a555becdf712bb991a942b42404a" } },
+  "presentation": { "persist_taps": ["r_equity"], "emit": ["family_table", "selection_report"] }
+}

fieldtests/cycle-277-parallel-cell-loop/p277_3_campaign_dup_instrument.json

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+{
+  "format_version": 1,
+  "kind": "campaign",
+  "name": "p277-duplicate-instrument",
+  "seed": 42,
+  "data": {
+    "instruments": ["GER40", "FRA40", "GER40"],
+    "windows": [ { "from_ms": 1725148800000, "to_ms": 1727740800000 } ]
+  },
+  "strategies": [
+    {
+      "ref": { "content_id": "597d719b7ac607158cda3e68cd497387620397a5e93087e23da512876dafba9a" },
+      "axes": {
+        "fast.length": { "kind": "I64", "values": [2, 4] },
+        "slow.length": { "kind": "I64", "values": [8, 16] },
+        "bias.scale": { "kind": "F64", "values": [0.5] }
+      }
+    }
+  ],
+  "process": { "ref": { "content_id": "1733ead3e5d83e4d1bee329bd0d897175b23a555becdf712bb991a942b42404a" } },
+  "presentation": { "persist_taps": [], "emit": ["family_table", "selection_report"] }
+}

fieldtests/cycle-277-parallel-cell-loop/p277_4_campaign_faultcell.json

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+{
+  "format_version": 1,
+  "kind": "campaign",
+  "name": "p277-fault-cell-partial-coverage",
+  "seed": 42,
+  "data": {
+    "instruments": ["EURUSD", "GER40"],
+    "windows": [ { "from_ms": 1338508800000, "to_ms": 1341100800000 } ]
+  },
+  "strategies": [
+    {
+      "ref": { "content_id": "597d719b7ac607158cda3e68cd497387620397a5e93087e23da512876dafba9a" },
+      "axes": {
+        "fast.length": { "kind": "I64", "values": [2, 4] },
+        "slow.length": { "kind": "I64", "values": [8, 16] },
+        "bias.scale": { "kind": "F64", "values": [0.5] }
+      }
+    }
+  ],
+  "process": { "ref": { "content_id": "1733ead3e5d83e4d1bee329bd0d897175b23a555becdf712bb991a942b42404a" } },
+  "presentation": { "persist_taps": [], "emit": ["family_table", "selection_report"] }
+}

fieldtests/cycle-277-parallel-cell-loop/p277_process_sweep_gate.json

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+{
+  "format_version": 1,
+  "kind": "process",
+  "name": "p277-sweep-gate",
+  "description": "Fieldtest process: rank the axis grid by sqn (deflated), then keep only members with positive expectancy_r.",
+  "pipeline": [
+    { "block": "std::sweep", "metric": "sqn", "select": "argmax", "deflate": true },
+    { "block": "std::gate", "all": [ { "metric": "expectancy_r", "cmp": "gt", "value": 0.0 } ] }
+  ]
+}

fieldtests/cycle-277-parallel-cell-loop/p277_strategy_smacross_open.json

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+[
+  {"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"}
+]