test(cli): pin the exact generalize grade — byte-identity anchor (#210)

The current `aura generalize` binds its protective stop as a grid axis
(`r_sma_sweep_family` with `stop_open=true`); the pending generalize
dissolution rebinds the same stop through the risk-regime seam
(`RiskRegime::Vol -> StopRule::Vol`). The existing generalize e2e
(`generalize_grades_a_candidate_across_two_instruments`) asserts shape
only — `worst_case` and the per-instrument R floats are never checked —
so a divergence between the two stop bindings would ship green.

This adds `generalize_real_e2e_pins_the_exact_current_grade`, capturing
the exact current R grade of the identical invocation (GER40 0.0105637…,
USDJPY 0.0057959…, worst_case 0.0057959…, sign_agreement 2). Green today
against the inline path; after the dissolution the same command must
reproduce these bytes — the acceptance gate that catches a stop-mechanism
divergence loudly instead of silently.

Resolves the generalize-dissolution grounding block (the unpinned
stop-mechanism R equivalence) by the risk-regime characterization-pin
pattern. refs #210

crates/aura-cli/tests/cli_run.rs

@@ -3582,6 +3582,61 @@ fn generalize_grades_a_candidate_across_two_instruments() {
     assert!(stdout.contains("\"family_id\":\"generalize-0\""), "family handle: {stdout}");
 }
 
+/// Characterization pin (byte-identity anchor for the generalize dissolution,
+/// #210). The current `aura generalize` binds its protective stop as a grid axis
+/// (`r_sma_sweep_family` with `stop_open=true`); the dissolution rebinds the same
+/// stop through the risk-regime seam (`RiskRegime::Vol -> StopRule::Vol`). The
+/// sibling `generalize_grades_a_candidate_across_two_instruments` asserts shape
+/// only — `worst_case` and the per-instrument R floats are never checked — so a
+/// stop-mechanism divergence between the two bindings would ship green. This pins
+/// the EXACT current R grade of the identical invocation; after the dissolution
+/// the same command must reproduce these bytes (the acceptance gate), and any
+/// drift fails here loudly. Gated on the shared GER40/USDJPY Sept-2024 archive;
+/// skips cleanly on a data refusal.
+#[test]
+fn generalize_real_e2e_pins_the_exact_current_grade() {
+    const FROM_MS: &str = "1725148800000";
+    const TO_MS: &str = "1727740799999";
+    let cwd = temp_cwd("generalize-exact-grade");
+    let out = std::process::Command::new(env!("CARGO_BIN_EXE_aura"))
+        .args([
+            "generalize", "--strategy", "r-sma", "--real", "GER40,USDJPY",
+            "--fast", "3", "--slow", "12", "--stop-length", "14", "--stop-k", "2.0",
+            "--from", FROM_MS, "--to", TO_MS,
+        ])
+        .current_dir(&cwd)
+        .output()
+        .expect("spawn aura");
+    if out.status.code() == Some(1) {
+        let stderr = String::from_utf8_lossy(&out.stderr);
+        assert!(
+            stderr.contains("no local data") || stderr.contains("no recorded geometry"),
+            "exit 1 must be a data refusal, got: {stderr}"
+        );
+        eprintln!("skip: no local GER40/USDJPY data");
+        return;
+    }
+    assert_eq!(out.status.code(), Some(0), "exit: {:?}", out.status);
+    let stdout = String::from_utf8(out.stdout).expect("utf-8 stdout");
+    let grade_line = stdout
+        .lines()
+        .find(|l| l.starts_with("{\"generalize\":"))
+        .unwrap_or_else(|| panic!("the generalize grade line: {stdout}"));
+    let v: serde_json::Value = serde_json::from_str(grade_line).expect("grade line parses as JSON");
+    let g = &v["generalize"];
+    assert_eq!(g["metric"].as_str(), Some("expectancy_r"), "metric: {grade_line}");
+    assert_eq!(g["n_instruments"].as_u64(), Some(2), "two instruments: {grade_line}");
+    assert_eq!(g["sign_agreement"].as_u64(), Some(2), "both agree in sign: {grade_line}");
+    // EXACT R floats — the byte-identity anchor the dissolution must preserve.
+    assert_eq!(g["worst_case"].as_f64(), Some(0.005795903617609842), "worst-case R floor: {grade_line}");
+    let per = g["per_instrument"].as_array().expect("per_instrument is an array");
+    assert_eq!(per.len(), 2, "two per-instrument grades: {grade_line}");
+    assert_eq!(per[0][0].as_str(), Some("GER40"), "first instrument: {grade_line}");
+    assert_eq!(per[0][1].as_f64(), Some(0.01056371324510624), "GER40 expectancy R: {grade_line}");
+    assert_eq!(per[1][0].as_str(), Some("USDJPY"), "second instrument: {grade_line}");
+    assert_eq!(per[1][1].as_f64(), Some(0.005795903617609842), "USDJPY expectancy R: {grade_line}");
+}
+
 /// Property: a single-instrument generalize is refused at parse time (exit 2),
 /// before any data access — so it asserts the arity refusal on any machine.
 #[test]