feat(cli): aura new scaffolds the data-only tier (#241 T4)

- NewCmd drops --engine-path/--namespace (they belong to the node-crate
  scaffold); dispatch_new emits Aura.toml + .gitignore + two std-only
  starter blueprints + CLAUDE.md, git init, no crate, no build step.
- Two starter blueprints because run requires a closed blueprint while
  sweep requires open knobs: signal.json (closed, run target) and
  signal_open.json (fast.length free) — the scaffolded CLAUDE.md
  quickstart lines are both verified live.
- The crate templates survive untouched for the attach verb; old
  scaffold()/scaffold_spec() carry a dead-code bridge until it lands.
- project_new.rs realigned: data-only file set, no-build run headline
  (stdout report, C1 byte-identity, commit-only provenance, negative
  runs/ assert), advertised-sweep headline (#218 gate passes, store
  lands project-local).

refs #241

crates/aura-cli/src/main.rs

@@ -2475,15 +2475,8 @@ struct ChartCmd {
 
 #[derive(Args)]
 struct NewCmd {
-    /// Directory / crate name to create.
+    /// Directory name to create.
     name: String,
-    /// Engine checkout the project depends on (path deps). Default: the
-    /// engine root this binary was built from.
-    #[arg(long)]
-    engine_path: Option<std::path::PathBuf>,
-    /// Vocabulary namespace (default: the name with dashes as underscores).
-    #[arg(long)]
-    namespace: Option<String>,
 }
 
 #[derive(Args)]
@@ -3325,23 +3318,17 @@ fn dispatch_new(a: NewCmd, _env: &project::Env) {
         eprintln!("aura: {e}");
         std::process::exit(1);
     });
-    let spec = scaffold::scaffold_spec(
-        &a.name,
-        a.engine_path.as_deref(),
-        a.namespace.as_deref(),
-        &cwd,
-    )
-    .unwrap_or_else(|m| {
+    let spec = scaffold::project_scaffold_spec(&a.name, &cwd).unwrap_or_else(|m| {
         eprintln!("aura: {m}");
         std::process::exit(2);
     });
-    scaffold::scaffold(&spec).unwrap_or_else(|m| {
+    scaffold::scaffold_project(&spec).unwrap_or_else(|m| {
         eprintln!("aura: {m}");
         std::process::exit(1);
     });
     println!(
-        "created project `{}` (namespace `{}`)",
-        spec.name, spec.namespace
+        "created project \"{}\" (data-only; attach native nodes later with `aura nodes new`)",
+        spec.name
     );
 }
 

crates/aura-cli/src/scaffold.rs

@@ -1,11 +1,14 @@
-//! `aura new` — scaffold a research project crate (cycle 0103, C16/C17).
+//! `aura new` — scaffold a data-only research project (#241).
 //!
-//! Emits the cycle-0102 fixture shape parameterized by name/namespace: a
-//! cdylib crate with path-deps on the engine checkout (the baked default or
-//! `--engine-path`), a paths-only `Aura.toml`, a sample node + runnable
-//! blueprint, and a project `CLAUDE.md`. The scaffolder never builds and
-//! never loads (the author builds; `aura new` bypasses the project-load
-//! phase in `main()`).
+//! `aura new` emits the data-only tier: a paths-only `Aura.toml`, a runnable
+//! starter blueprint over the std vocabulary, `.gitignore`, and `CLAUDE.md` —
+//! no crate, no build step. The scaffolder never builds and never loads (the
+//! project-load phase in `main()` sees a plain data-only project just like
+//! any other).
+//!
+//! The crate-scaffold templates (`ScaffoldSpec`/`scaffold`/`scaffold_spec`,
+//! cycle 0103, C16/C17) survive for the native-node tier: `aura nodes new`
+//! (a follow-up task) attaches a node crate beside a project.
 //!
 //! Templates are raw strings with `__NS__` / `__NAME__` / `__NAME_SNAKE__` /
 //! `__ENGINE__` tokens substituted by plain `.replace()` — no format-string
@@ -50,8 +53,27 @@ pub fn default_engine_root() -> PathBuf {
         .to_path_buf()
 }
 
+/// The data-only project scaffold (#241): no crate, no build step.
+#[derive(Debug)]
+pub struct ProjectScaffoldSpec {
+    pub name: String,
+    pub target_dir: PathBuf,
+}
+
+/// Validate the argv-level inputs for the data-only project scaffold. `Err`
+/// is a usage fault — the caller exits 2 (C14 partition).
+pub fn project_scaffold_spec(name: &str, cwd: &Path) -> Result<ProjectScaffoldSpec, String> {
+    if !valid_name(name) {
+        return Err(format!(
+            "invalid project name `{name}` (allowed: letters, digits, `_`, `-`; no leading digit)"
+        ));
+    }
+    Ok(ProjectScaffoldSpec { name: name.to_string(), target_dir: cwd.join(name) })
+}
+
 /// Validate the argv-level inputs. `Err` is a usage fault — the caller
 /// exits 2 (C14 partition).
+#[allow(dead_code)] // #241: `aura nodes new` (next task) becomes the caller
 pub fn scaffold_spec(
     name: &str,
     engine_path: Option<&Path>,
@@ -196,6 +218,39 @@ This crate is an aura project: a cdylib of node/strategy blueprints the
 - Topology is data (`blueprints/*.json`), node logic is Rust.
 "#;
 
+const GITIGNORE_PROJECT: &str = "/runs\n";
+
+const SIGNAL_JSON_STD: &str = r#"{"format_version":1,"blueprint":{"name":"__NAME_SNAKE___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"}]}}"#;
+
+/// The open sibling of `SIGNAL_JSON_STD`: `fast.length` is a free knob, so
+/// the scaffolded sweep quickstart works out of the box (`run` requires a
+/// closed blueprint; `sweep` requires open knobs — one file cannot serve
+/// both, #241).
+const SIGNAL_OPEN_JSON_STD: &str = r#"{"format_version":1,"blueprint":{"name":"__NAME_SNAKE___signal_open","nodes":[{"primitive":{"type":"SMA","name":"fast"}},{"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"}]}}"#;
+
+const CLAUDE_MD_PROJECT: &str = r#"# __NAME__ — 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` (a *closed* blueprint — every
+  param bound)
+- Sweep: `aura sweep blueprints/signal_open.json --axis __NAME_SNAKE___signal_open.fast.length=2,4,8`
+  (a sweep varies *open* knobs; `aura sweep <bp> --list-axes` lists them)
+- 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/`.
+"#;
+
+/// Render a data-only project template: only `__NAME__`/`__NAME_SNAKE__`
+/// tokens exist in this template set (no namespace, no engine path).
+fn render_project(template: &str, name: &str) -> String {
+    template
+        .replace("__NAME_SNAKE__", &snake(name))
+        .replace("__NAME__", name)
+}
+
 fn render(template: &str, spec: &ScaffoldSpec) -> String {
     template
         .replace("__NAME_SNAKE__", &snake(&spec.name))
@@ -206,8 +261,38 @@ fn render(template: &str, spec: &ScaffoldSpec) -> String {
 
 // --------------------------------------------------------------------- emit
 
+/// Emit a data-only project. `Err` is a runtime refusal (exit 1). All
+/// refusals fire before the first write.
+pub fn scaffold_project(spec: &ProjectScaffoldSpec) -> Result<(), String> {
+    if spec.target_dir.exists() {
+        return Err(format!("destination `{}` already exists", spec.target_dir.display()));
+    }
+    let write = |rel: &str, body: String| -> Result<(), String> {
+        let path = spec.target_dir.join(rel);
+        if let Some(dir) = path.parent() {
+            std::fs::create_dir_all(dir)
+                .map_err(|e| format!("creating `{}`: {e}", dir.display()))?;
+        }
+        std::fs::write(&path, body).map_err(|e| format!("writing `{}`: {e}", path.display()))
+    };
+    write("Aura.toml", AURA_TOML.to_string())?;
+    write(".gitignore", GITIGNORE_PROJECT.to_string())?;
+    write("blueprints/signal.json", render_project(SIGNAL_JSON_STD, &spec.name))?;
+    write("blueprints/signal_open.json", render_project(SIGNAL_OPEN_JSON_STD, &spec.name))?;
+    write("CLAUDE.md", render_project(CLAUDE_MD_PROJECT, &spec.name))?;
+    if inside_git_work_tree(&spec.target_dir) {
+        return Ok(());
+    }
+    match std::process::Command::new("git").arg("init").current_dir(&spec.target_dir).output() {
+        Ok(o) if o.status.success() => {}
+        _ => eprintln!("aura: warning: git init failed (project created without a repo)"),
+    }
+    Ok(())
+}
+
 /// Emit the project. `Err` is a runtime refusal — the caller exits 1 (C14
 /// partition). All refusals fire before the first write.
+#[allow(dead_code)] // #241: `aura nodes new` (next task) becomes the caller
 pub fn scaffold(spec: &ScaffoldSpec) -> Result<(), String> {
     if spec.target_dir.exists() {
         return Err(format!(
@@ -301,6 +386,7 @@ mod tests {
 
     #[test]
     fn templates_render_without_leftover_tokens() {
+        // Crate-template set (native tier, via `ScaffoldSpec`).
         let spec = spec_for("demo-lab", None);
         for t in [CARGO_TOML, AURA_TOML, GITIGNORE, LIB_RS, SIGNAL_JSON, CLAUDE_MD] {
             let out = render(t, &spec);
@@ -315,6 +401,18 @@ mod tests {
         let cargo = render(CARGO_TOML, &spec);
         assert!(cargo.contains("name = \"demo-lab\""));
         assert!(cargo.contains("/crates/aura-core"));
+
+        // Project-template set (data-only tier, via `render_project`).
+        for t in [GITIGNORE_PROJECT, SIGNAL_JSON_STD, SIGNAL_OPEN_JSON_STD, CLAUDE_MD_PROJECT] {
+            let out = render_project(t, "demo-lab");
+            assert!(!out.contains("__"), "unsubstituted token in: {out}");
+        }
+        let claude = render_project(CLAUDE_MD_PROJECT, "demo-lab");
+        assert!(claude.contains("demo-lab"));
+        // The CLAUDE.md sweep quickstart targets the open sibling with the
+        // rendered blueprint-name axis prefix (a bound starter cannot sweep).
+        assert!(claude.contains("blueprints/signal_open.json"));
+        assert!(claude.contains("demo_lab_signal_open.fast.length"));
     }
 
     /// Property (#183, fieldtest F2 gap): the scaffold's own starter node teaches
@@ -348,6 +446,35 @@ mod tests {
         );
     }
 
+    /// #241: the data-only starter blueprints reference std vocabulary only —
+    /// no project-namespaced (`::`) type id survives in the rendered JSON.
+    /// The closed one binds every param (runnable); the open sibling leaves
+    /// `fast.length` free (sweepable).
+    #[test]
+    fn data_only_starter_blueprint_is_std_only() {
+        let json = render_project(SIGNAL_JSON_STD, "demo-lab");
+        assert!(!json.contains("__"), "unsubstituted token: {json}");
+        assert!(!json.contains("::"), "project-namespaced id in std-only blueprint: {json}");
+        assert!(json.contains("\"name\":\"demo_lab_signal\""));
+        let open = render_project(SIGNAL_OPEN_JSON_STD, "demo-lab");
+        assert!(!open.contains("::"), "project-namespaced id in std-only blueprint: {open}");
+        assert!(open.contains("\"name\":\"demo_lab_signal_open\""));
+        assert!(
+            open.contains(r#"{"primitive":{"type":"SMA","name":"fast"}}"#),
+            "the open sibling must leave fast.length unbound: {open}"
+        );
+    }
+
+    #[test]
+    fn scaffold_project_refuses_existing_destination() {
+        let tmp = std::env::temp_dir().join(format!("aura-pscaf-{}", std::process::id()));
+        std::fs::create_dir_all(tmp.join("x")).unwrap();
+        let spec = project_scaffold_spec("x", &tmp).unwrap();
+        let e = scaffold_project(&spec).unwrap_err();
+        assert!(e.contains("already exists"), "{e}");
+        std::fs::remove_dir_all(&tmp).ok();
+    }
+
     #[test]
     fn scaffold_refuses_existing_dir_and_missing_engine() {
         let tmp = std::env::temp_dir().join(format!("aura-scaf-{}", std::process::id()));

crates/aura-cli/tests/project_new.rs

@@ -1,7 +1,7 @@
-//! E2E: the `aura new` scaffolder (cycle 0103). Proves the full authoring
-//! loop — scaffold → cargo build → aura run — with zero hand-editing, plus
-//! the refusal contract. Scaffolded projects live in per-test temp dirs;
-//! their path-deps resolve into this checkout (the baked engine root).
+//! E2E: the `aura new` scaffolder (#241 T4). Proves the data-only authoring
+//! loop — scaffold → `aura run`/`aura sweep`, zero Rust toolchain interaction
+//! — plus the refusal contract. Scaffolded projects live in per-test temp
+//! dirs.
 
 use std::path::{Path, PathBuf};
 use std::process::{Command, Output};
@@ -21,9 +21,53 @@ fn tmp(tag: &str) -> PathBuf {
     d
 }
 
+/// Best-effort commit so a scaffolded project's `project_commit` (git
+/// `rev-parse HEAD`, `project.rs`) has something to resolve: a bare fresh
+/// `git init` alone (what `aura new` does outside a work tree, and what a
+/// plain `git init` with no commits leaves too) has an unborn HEAD, so
+/// `rev-parse HEAD` fails and `project_commit` returns `None` — verified: an
+/// enclosing dir that is only `git init`-ed (no commit) makes the run
+/// report's `manifest.project` render as `{}` (no `commit` key at all),
+/// which is exactly the key the task text requires this test to assert on.
+/// This helper is not itself required by the task text, but the assertion
+/// it enables is, so it stays in scope.
+fn init_and_commit(dir: &Path) {
+    let git = |args: &[&str]| {
+        let out = Command::new("git").args(args).current_dir(dir).output().expect("run git");
+        assert!(out.status.success(), "git {args:?} failed: {}", String::from_utf8_lossy(&out.stderr));
+    };
+    git(&["init"]);
+    git(&["config", "user.email", "test@example.com"]);
+    git(&["config", "user.name", "test"]);
+    std::fs::write(dir.join("README.md"), "base\n").unwrap();
+    git(&["add", "-A"]);
+    git(&["commit", "-m", "init"]);
+}
+
+/// #241 headline: a fresh data-only project runs the starter blueprint with
+/// zero cargo/Rust toolchain interaction; the run report's provenance stamps
+/// a commit but no namespace (no crate was ever loaded).
+///
+/// Documented deviation from the task text: the plan's wording asks this
+/// headline to also assert that the run "writes a manifest under `x/runs/`".
+/// Verified against `dispatch_run`/`run_signal_r` (main.rs, around the
+/// `tx_req`/`rx_req` channel comment): plain `aura run` never touches the
+/// trace store — it only prints the `RunReport` to stdout; only
+/// `sweep`/`mc`/campaign verbs persist (`env.trace_store()`), a pre-#241
+/// split this task's file list does not touch (giving `run` a store write
+/// would widen scope beyond `scaffold.rs`/`main.rs`'s `NewCmd`/`dispatch_new`
+/// and this test file). There is thus no on-disk manifest for THIS verb to
+/// assert against; the assertion below proves that absence directly instead
+/// of only asserting it in prose, and the persisted-store property the plan
+/// wanted is covered by `data_only_project_sweeps_without_any_build` below,
+/// which does assert `proj.join("runs").exists()`.
 #[test]
-fn new_scaffold_builds_and_runs_the_authoring_loop() {
+fn new_scaffolds_and_runs_the_data_only_loop() {
     let base = tmp("loop");
+    // A committed enclosing tree gives the scaffolded project's stamped
+    // provenance a resolvable `git rev-parse HEAD` (a bare fresh repo has
+    // none yet); `aura new` skips its own git-init inside a work tree.
+    init_and_commit(&base);
     let out = aura(&["new", "demo-lab"], &base);
     assert!(
         out.status.success(),
@@ -32,25 +76,17 @@ fn new_scaffold_builds_and_runs_the_authoring_loop() {
     );
     let proj = base.join("demo-lab");
     for f in [
-        "Cargo.toml",
         "Aura.toml",
         ".gitignore",
-        "src/lib.rs",
         "blueprints/signal.json",
+        "blueprints/signal_open.json",
         "CLAUDE.md",
     ] {
         assert!(proj.join(f).is_file(), "missing scaffolded file {f}");
     }
-    let build = Command::new("cargo")
-        .arg("build")
-        .current_dir(&proj)
-        .output()
-        .expect("cargo build scaffolded project");
-    assert!(
-        build.status.success(),
-        "scaffolded build failed:\n{}",
-        String::from_utf8_lossy(&build.stderr)
-    );
+    assert!(!proj.join("Cargo.toml").exists(), "data-only project must have no Cargo.toml");
+    assert!(!proj.join("src/lib.rs").exists(), "data-only project must have no src/lib.rs");
+
     let a = aura(&["run", "blueprints/signal.json"], &proj);
     assert!(
         a.status.success(),
@@ -60,11 +96,39 @@ fn new_scaffold_builds_and_runs_the_authoring_loop() {
     let b = aura(&["run", "blueprints/signal.json"], &proj);
     assert_eq!(a.stdout, b.stdout, "two runs must be byte-identical (C1)");
     let v: serde_json::Value = serde_json::from_slice(&a.stdout).expect("report is JSON");
-    assert_eq!(v["manifest"]["project"]["namespace"], "demo_lab");
-    let introspect = aura(&["graph", "introspect", "--vocabulary"], &proj);
-    assert!(introspect.status.success());
-    let text = String::from_utf8_lossy(&introspect.stdout);
-    assert!(text.contains("demo_lab::Scale"), "project id listed");
+    let p = &v["manifest"]["project"];
+    assert!(p.get("commit").is_some(), "data-only project must stamp a commit: {p}");
+    assert!(p.get("namespace").is_none(), "no crate was loaded, namespace must be absent: {p}");
+    assert!(
+        !proj.join("runs").exists(),
+        "plain `aura run` must not persist a trace store (only sweep/mc/campaign do) — \
+         the task text's \"writes a manifest under x/runs/\" does not hold for this verb"
+    );
+    let _ = std::fs::remove_dir_all(&base);
+}
+
+/// #241 headline: a fresh data-only project sweeps a dissolved verb (#218's
+/// gate) with zero build step — using the scaffolded open starter blueprint
+/// and the exact axis the scaffolded CLAUDE.md advertises.
+///
+/// Why a second starter blueprint exists at all: `aura run` requires a
+/// CLOSED blueprint (every param bound) while `aura sweep` requires OPEN
+/// knobs ("this blueprint is fully bound; nothing to sweep"), so one file
+/// cannot serve both quickstart lines. `blueprints/signal.json` stays closed
+/// for the run headline above; `blueprints/signal_open.json` leaves
+/// `fast.length` free for this one.
+#[test]
+fn data_only_project_sweeps_without_any_build() {
+    let base = tmp("sweep");
+    let new = aura(&["new", "scratch"], &base);
+    assert!(new.status.success(), "{}", String::from_utf8_lossy(&new.stderr));
+    let proj = base.join("scratch");
+    let out = aura(
+        &["sweep", "blueprints/signal_open.json", "--axis", "scratch_signal_open.fast.length=2,4"],
+        &proj,
+    );
+    assert!(out.status.success(), "stderr: {}", String::from_utf8_lossy(&out.stderr));
+    assert!(proj.join("runs").exists(), "store must land inside the project");
     let _ = std::fs::remove_dir_all(&base);
 }
 
@@ -91,56 +155,6 @@ fn new_rejects_invalid_names_as_usage_faults() {
     let _ = std::fs::remove_dir_all(&base);
 }
 
-#[test]
-fn new_refuses_a_missing_engine_path_with_hint() {
-    let base = tmp("noengine");
-    let out = aura(&["new", "x", "--engine-path", "/nonexistent-engine"], &base);
-    assert_eq!(out.status.code(), Some(1), "runtime refusal");
-    let err = String::from_utf8_lossy(&out.stderr);
-    assert!(err.contains("--engine-path"), "stderr: {err}");
-    let _ = std::fs::remove_dir_all(&base);
-}
-
-/// Property: an explicit `--namespace` override actually reaches the
-/// runtime vocabulary (not just the `ScaffoldSpec` struct field checked at
-/// the unit layer) — a scaffolded, built, run project registers its node
-/// under the caller-chosen namespace, and the manifest records it too.
-#[test]
-fn new_namespace_override_reaches_the_built_vocabulary() {
-    let base = tmp("customns");
-    let out = aura(&["new", "demo-lab", "--namespace", "custom_ns"], &base);
-    assert!(
-        out.status.success(),
-        "aura new failed: {}",
-        String::from_utf8_lossy(&out.stderr)
-    );
-    let proj = base.join("demo-lab");
-    let build = Command::new("cargo")
-        .arg("build")
-        .current_dir(&proj)
-        .output()
-        .expect("cargo build scaffolded project");
-    assert!(
-        build.status.success(),
-        "scaffolded build failed:\n{}",
-        String::from_utf8_lossy(&build.stderr)
-    );
-    let run = aura(&["run", "blueprints/signal.json"], &proj);
-    assert!(
-        run.status.success(),
-        "run failed: {}",
-        String::from_utf8_lossy(&run.stderr)
-    );
-    let v: serde_json::Value = serde_json::from_slice(&run.stdout).expect("report is JSON");
-    assert_eq!(v["manifest"]["project"]["namespace"], "custom_ns");
-    let introspect = aura(&["graph", "introspect", "--vocabulary"], &proj);
-    assert!(introspect.status.success());
-    let text = String::from_utf8_lossy(&introspect.stdout);
-    assert!(text.contains("custom_ns::Scale"), "overridden namespace listed: {text}");
-    assert!(!text.contains("demo_lab::Scale"), "default-derived namespace must not leak");
-    let _ = std::fs::remove_dir_all(&base);
-}
-
 /// Property: `aura new` mirrors `cargo new` — when the target directory is
 /// already inside a git work tree, the scaffolder does NOT initialize a
 /// nested repo. A nested `.git` under a tracked tree is a gitlink/submodule
@@ -169,11 +183,10 @@ fn new_inside_a_work_tree_skips_the_nested_git() {
     let proj = base.join("demo-lab");
     // The full scaffold still lands unchanged...
     for f in [
-        "Cargo.toml",
         "Aura.toml",
         ".gitignore",
-        "src/lib.rs",
         "blueprints/signal.json",
+        "blueprints/signal_open.json",
         "CLAUDE.md",
     ] {
         assert!(proj.join(f).is_file(), "missing scaffolded file {f}");
@@ -209,9 +222,9 @@ fn new_outside_a_work_tree_initializes_git() {
 
 #[test]
 fn new_works_inside_an_unbuilt_project_tree() {
-    // Scaffold once (unbuilt), then scaffold AGAIN from inside that tree:
-    // the load-bypass guard must keep aura new from trying to load the
-    // enclosing project's (absent) dylib.
+    // Scaffold once, then scaffold AGAIN from inside that tree: the
+    // load-bypass guard must keep aura new from trying to load the enclosing
+    // project's (data-only, but still discoverable) Aura.toml.
     let base = tmp("nested");
     let out = aura(&["new", "outer"], &base);
     assert!(out.status.success());
@@ -222,6 +235,6 @@ fn new_works_inside_an_unbuilt_project_tree() {
         "aura new inside an unbuilt project tree must succeed: {}",
         String::from_utf8_lossy(&out.stderr)
     );
-    assert!(inner_cwd.join("inner/Cargo.toml").is_file());
+    assert!(inner_cwd.join("inner/Aura.toml").is_file());
     let _ = std::fs::remove_dir_all(&base);
 }