diff --git a/crates/aura-campaign/src/exec.rs b/crates/aura-campaign/src/exec.rs
index b14956f..6949450 100644
--- a/crates/aura-campaign/src/exec.rs
+++ b/crates/aura-campaign/src/exec.rs
@@ -554,6 +554,7 @@ fn placeholder_report(params: &[(String, Scalar)], window_ms: (i64, i64)) -> Run
         manifest: RunManifest {
             commit: String::new(),
             params: params.to_vec(),
+            defaults: Vec::new(),
             window: (Timestamp(window_ms.0), Timestamp(window_ms.1)),
             seed: 0,
             broker: "faulted-member-placeholder".to_string(),
diff --git a/crates/aura-campaign/src/lib.rs b/crates/aura-campaign/src/lib.rs
index 4bd8bf4..0907e87 100644
--- a/crates/aura-campaign/src/lib.rs
+++ b/crates/aura-campaign/src/lib.rs
@@ -339,6 +339,7 @@ mod tests {
             manifest: RunManifest {
                 commit: "test".to_string(),
                 params: vec![],
+                defaults: vec![],
                 window: (Timestamp(0), Timestamp(1)),
                 seed: 0,
                 broker: "sim".to_string(),
@@ -1019,6 +1020,7 @@ mod wf_tests {
                 manifest: RunManifest {
                     commit: "wf-fake".to_string(),
                     params: params.to_vec(),
+                    defaults: Vec::new(),
                     window: (Timestamp(window_ms.0), Timestamp(window_ms.1)),
                     seed: 0,
                     broker: "fake".to_string(),
diff --git a/crates/aura-campaign/tests/execute.rs b/crates/aura-campaign/tests/execute.rs
index eb7585d..abab2d6 100644
--- a/crates/aura-campaign/tests/execute.rs
+++ b/crates/aura-campaign/tests/execute.rs
@@ -58,6 +58,7 @@ fn planted_report(cell: &CellSpec, params: &[(String, Scalar)], window_ms: (i64,
         manifest: RunManifest {
             commit: "fake".to_string(),
             params: params.to_vec(),
+            defaults: Vec::new(),
             window: (Timestamp(window_ms.0), Timestamp(window_ms.1)),
             seed: 0,
             broker: "fake".to_string(),
diff --git a/crates/aura-campaign/tests/member_seam_e2e.rs b/crates/aura-campaign/tests/member_seam_e2e.rs
index 82e7308..8f724a2 100644
--- a/crates/aura-campaign/tests/member_seam_e2e.rs
+++ b/crates/aura-campaign/tests/member_seam_e2e.rs
@@ -46,6 +46,7 @@ impl MemberRunner for FixedRunner {
             manifest: RunManifest {
                 commit: "e2e".to_string(),
                 params: vec![],
+                defaults: vec![],
                 window: (Timestamp(window_ms.0), Timestamp(window_ms.1)),
                 seed: 0,
                 broker: "test".to_string(),
@@ -98,6 +99,7 @@ fn rankable_metrics_are_all_per_member_resolvable() {
         manifest: RunManifest {
             commit: "e2e".to_string(),
             params: vec![],
+            defaults: vec![],
             window: (Timestamp(0), Timestamp(1)),
             seed: 0,
             broker: "test".to_string(),
diff --git a/crates/aura-cli/src/campaign_run.rs b/crates/aura-cli/src/campaign_run.rs
index 77929e1..c50942c 100644
--- a/crates/aura-cli/src/campaign_run.rs
+++ b/crates/aura-cli/src/campaign_run.rs
@@ -1058,6 +1058,7 @@ mod tests {
             manifest: RunManifest {
                 commit: "test".to_string(),
                 params,
+                defaults: Vec::new(),
                 window: (Timestamp(0), Timestamp(0)),
                 seed: 0,
                 broker: "test".to_string(),
diff --git a/crates/aura-cli/src/main.rs b/crates/aura-cli/src/main.rs
index 7de8078..78085d7 100644
--- a/crates/aura-cli/src/main.rs
+++ b/crates/aura-cli/src/main.rs
@@ -127,6 +127,7 @@ fn sim_optimal_manifest(
     RunManifest {
         commit: option_env!("AURA_COMMIT").unwrap_or("unknown").to_string(),
         params,
+        defaults: Vec::new(),
         window,
         seed,
         broker: format!("sim-optimal(pip_size={pip_size})"),
@@ -137,6 +138,24 @@ fn sim_optimal_manifest(
     }
 }
 
+/// The wrap-prefixed BOUND-param defaults of `signal` (#249): every
+/// `bound_param_space()` entry as a `(<signal.name()>.<param>, value)` pair, in
+/// `bound_param_space()` order — the `RunManifest.defaults` field. Must be read
+/// off `signal` BEFORE it is consumed by `wrap_r`/reopening: an axis-reopened
+/// bound param has already left `bound_param_space()` by construction
+/// (`Composite::reopen` forgets the bound value), so a caller that reopens
+/// overrides before calling this naturally excludes them — no separate filter
+/// needed. Same prefixing rule as `wrapped_bound_names`, kept separate because
+/// that helper discards the value this one needs.
+fn wrapped_bound_defaults(signal: &Composite) -> Vec<(String, Scalar)> {
+    let prefix = format!("{}.", signal.name());
+    signal
+        .bound_param_space()
+        .into_iter()
+        .map(|b| (format!("{prefix}{}", b.name), b.value))
+        .collect()
+}
+
 /// Map any byte outside the portable directory-name charset `[A-Za-z0-9._-]` to
 /// `_`. The single source of filesystem-portability for an on-disk path component
 /// (valid on Linux / Windows / macOS, also URL-path- and cloud-sync-safe). Used by
@@ -1691,6 +1710,7 @@ fn run_signal_r(
         .iter()
         .map(|p| p.name.clone())
         .collect();
+    let defaults = wrapped_bound_defaults(&signal); // read before `signal` is consumed below
     let (tx_eq, rx_eq) = mpsc::channel();
     let (tx_ex, rx_ex) = mpsc::channel();
     let (tx_r, rx_r) = mpsc::channel();
@@ -1710,6 +1730,7 @@ fn run_signal_r(
     let named_params: Vec<(String, Scalar)> =
         names.into_iter().zip(params.iter().copied()).collect();
     let mut manifest = sim_optimal_manifest(named_params, window, seed, pip_size);
+    manifest.defaults = defaults;
     manifest.broker = r_sma_broker_label(pip_size);
     manifest.topology_hash = Some(topo);
     manifest.project = env.provenance();
@@ -1739,6 +1760,7 @@ fn run_blueprint_member(
     binding: &binding::ResolvedBinding,
     cost: &[aura_research::CostSpec],
 ) -> RunReport {
+    let defaults = wrapped_bound_defaults(&signal); // read before `signal` is consumed below
     let (tx_eq, rx_eq) = mpsc::channel();
     let (tx_ex, rx_ex) = mpsc::channel();
     let (tx_r, rx_r) = mpsc::channel();
@@ -1779,6 +1801,7 @@ fn run_blueprint_member(
         named.push((format!("cost[{k}].{knob}"), Scalar::f64(v)));
     }
     let mut manifest = sim_optimal_manifest(named, window, seed, pip);
+    manifest.defaults = defaults;
     manifest.broker = r_sma_broker_label(pip);
     manifest.topology_hash = Some(topo.to_string());
     manifest.project = env.provenance();
@@ -5497,6 +5520,38 @@ mod tests {
         assert!(!err.contains("UnknownKnob"), "must not leak the debug render: {err}");
     }
 
+    /// #249: an axis-reopened bound param flows through `params` ("what
+    /// varied") and must NOT also appear in `defaults` ("what was held") — the
+    /// two are disjoint by construction. Sweeping `fast.length` on the fully
+    /// bound r_sma example leaves `slow.length`/`bias.scale` untouched (they
+    /// stay in `defaults`), while `fast.length` moves to `params` and drops
+    /// out of `defaults` entirely.
+    #[test]
+    fn sweep_override_excludes_the_reopened_default_from_the_manifest() {
+        let env = project::Env::std();
+        let closed = load_closed_r_sma();
+        let doc = blueprint_to_json(&closed).expect("serializes");
+        let axes = vec![("sma_signal.fast.length".to_string(), vec![Scalar::i64(2)])];
+        let fam = blueprint_sweep_family(&doc, &axes, &DataSource::Synthetic, &env)
+            .expect("a bound param is a default — the axis overrides it");
+        assert_eq!(fam.points.len(), 1);
+        let manifest = &fam.points[0].report.manifest;
+
+        let param_names: Vec<&str> = manifest.params.iter().map(|(n, _)| n.as_str()).collect();
+        assert!(param_names.contains(&"sma_signal.fast.length"), "swept axis is a param: {param_names:?}");
+
+        let default_names: Vec<&str> = manifest.defaults.iter().map(|(n, _)| n.as_str()).collect();
+        assert!(
+            !default_names.contains(&"sma_signal.fast.length"),
+            "the reopened default must not also appear in defaults: {default_names:?}"
+        );
+        assert_eq!(
+            default_names,
+            ["sma_signal.slow.length", "sma_signal.bias.scale"],
+            "the untouched bound params stay in defaults: {default_names:?}"
+        );
+    }
+
     /// Property: an MC family's `aura reproduce` lines carry the member's own `seed=<N>`
     /// label. MC members hold no tuning params (the params-join is empty), so the line would
     /// otherwise print a BLANK member label; the seed is each draw's realization identity and
diff --git a/crates/aura-cli/tests/cli_run.rs b/crates/aura-cli/tests/cli_run.rs
index c1dfd95..034fa02 100644
--- a/crates/aura-cli/tests/cli_run.rs
+++ b/crates/aura-cli/tests/cli_run.rs
@@ -603,6 +603,7 @@ fn chart_opens_a_sweep_trace_family_by_its_printed_handle() {
     let manifest = || RunManifest {
         commit: "c0ffee".to_string(),
         params: vec![("fast".to_string(), Scalar::f64(2.0))],
+        defaults: vec![],
         window: (Timestamp(1), Timestamp(2)),
         seed: 0,
         broker: "sim-optimal(pip_size=1)".to_string(),
@@ -737,6 +738,7 @@ fn chart_resolves_a_trace_family_by_its_chosen_campaign_name() {
     let manifest = || RunManifest {
         commit: "c0ffee".to_string(),
         params: vec![("fast".to_string(), Scalar::f64(2.0))],
+        defaults: vec![],
         window: (Timestamp(1), Timestamp(2)),
         seed: 0,
         broker: "sim-optimal(pip_size=1)".to_string(),
@@ -819,6 +821,7 @@ fn chart_by_campaign_name_refuses_when_the_name_is_ambiguous() {
     let manifest = || RunManifest {
         commit: "c0ffee".to_string(),
         params: vec![("fast".to_string(), Scalar::f64(2.0))],
+        defaults: vec![],
         window: (Timestamp(1), Timestamp(2)),
         seed: 0,
         broker: "sim-optimal(pip_size=1)".to_string(),
diff --git a/crates/aura-engine/src/blueprint.rs b/crates/aura-engine/src/blueprint.rs
index a7cd5a7..40eedd7 100644
--- a/crates/aura-engine/src/blueprint.rs
+++ b/crates/aura-engine/src/blueprint.rs
@@ -1763,6 +1763,7 @@ mod tests {
             manifest: RunManifest {
                 commit: "test".to_string(),
                 params: Vec::new(),
+                defaults: Vec::new(),
                 window: (Timestamp(0), Timestamp(0)),
                 seed: 0,
                 broker: "test".to_string(),
diff --git a/crates/aura-engine/src/mc.rs b/crates/aura-engine/src/mc.rs
index 0dfacaf..730dd6b 100644
--- a/crates/aura-engine/src/mc.rs
+++ b/crates/aura-engine/src/mc.rs
@@ -239,6 +239,7 @@ mod tests {
             manifest: RunManifest {
                 commit: "test".to_string(),
                 params: Vec::new(),
+                defaults: Vec::new(),
                 window,
                 seed,
                 broker: "test".to_string(),
@@ -266,6 +267,7 @@ mod tests {
                     manifest: RunManifest {
                         commit: "t".to_string(),
                         params: Vec::new(),
+                        defaults: Vec::new(),
                         window: (Timestamp(0), Timestamp(0)),
                         seed: i as u64,
                         broker: "t".to_string(),
diff --git a/crates/aura-engine/src/report.rs b/crates/aura-engine/src/report.rs
index b8a6f2d..ffc4ed9 100644
--- a/crates/aura-engine/src/report.rs
+++ b/crates/aura-engine/src/report.rs
@@ -34,6 +34,16 @@ pub struct RunManifest {
     /// self-describing [`Scalar`], so the param's kind (an `i64` length vs an
     /// `f64` scale) survives into the record instead of collapsing to `f64`.
     pub params: Vec<(String, Scalar)>,
+    /// The bound params this run did NOT vary — the wrap-prefixed
+    /// `bound_param_space()` of the signal, EXCLUDING any bound param an axis
+    /// reopened (those flow through `params` instead, #246). Complements
+    /// `params` ("what varied") with "what was held": the two are disjoint by
+    /// construction. Empty for every pre-#249 record. One-directional serde
+    /// widening (C14/C18), identical idiom to `selection`/`instrument`/
+    /// `topology_hash` — except a `Vec`, not an `Option`, so it always
+    /// serializes (mirroring `params`), never skipped when empty.
+    #[serde(default)]
+    pub defaults: Vec<(String, Scalar)>,
     /// The data-window: inclusive `(from, to)` epoch-ns bounds (C12).
     pub window: (Timestamp, Timestamp),
     /// The RNG seed (C12 seed-as-input). `0` for a seed-free synthetic run.
@@ -298,7 +308,7 @@ mod tests {
     #[test]
     fn runmanifest_without_selection_serialises_without_the_key() {
         let m = RunManifest {
-            commit: "c".into(), params: vec![], window: (Timestamp(0), Timestamp(0)),
+            commit: "c".into(), params: vec![], defaults: vec![], window: (Timestamp(0), Timestamp(0)),
             seed: 0, broker: "b".into(), selection: None, instrument: None,
             topology_hash: None,
             project: None,
@@ -317,7 +327,7 @@ mod tests {
     #[test]
     fn runmanifest_instrument_round_trips_and_omits_when_none() {
         let with = RunManifest {
-            commit: "c".into(), params: vec![], window: (Timestamp(0), Timestamp(0)),
+            commit: "c".into(), params: vec![], defaults: vec![], window: (Timestamp(0), Timestamp(0)),
             seed: 0, broker: "b".into(), selection: None, instrument: Some("GER40".into()),
             topology_hash: None,
             project: None,
@@ -328,7 +338,7 @@ mod tests {
         assert_eq!(back.instrument, Some("GER40".to_string()));
 
         let without = RunManifest {
-            commit: "c".into(), params: vec![], window: (Timestamp(0), Timestamp(0)),
+            commit: "c".into(), params: vec![], defaults: vec![], window: (Timestamp(0), Timestamp(0)),
             seed: 0, broker: "b".into(), selection: None, instrument: None,
             topology_hash: None,
             project: None,
@@ -370,7 +380,7 @@ mod tests {
             commit: Some("deadbeef".into()),
         };
         let m = RunManifest {
-            commit: "c".into(), params: vec![], window: (Timestamp(0), Timestamp(0)),
+            commit: "c".into(), params: vec![], defaults: vec![], window: (Timestamp(0), Timestamp(0)),
             seed: 0, broker: "b".into(), selection: None, instrument: None,
             topology_hash: None,
             project: Some(p.clone()),
@@ -393,7 +403,7 @@ mod tests {
             neighbourhood_score: None, n_neighbours: None,
         };
         let m = RunManifest {
-            commit: "c".into(), params: vec![], window: (Timestamp(0), Timestamp(0)),
+            commit: "c".into(), params: vec![], defaults: vec![], window: (Timestamp(0), Timestamp(0)),
             seed: 0, broker: "b".into(), selection: Some(sel.clone()), instrument: None,
             topology_hash: None,
             project: None,
@@ -531,6 +541,7 @@ mod tests {
                     ("sma_slow".to_string(), Scalar::i64(4)),
                     ("bias_scale".to_string(), Scalar::f64(0.5)),
                 ],
+                defaults: vec![],
                 window: (Timestamp(1), Timestamp(5)),
                 seed: 0,
                 broker: "sim-optimal(pip_size=0.0001)".to_string(),
@@ -637,6 +648,7 @@ mod tests {
                     ("sma_slow".to_string(), Scalar::i64(4)),
                     ("bias_scale".to_string(), Scalar::f64(1.0)),
                 ],
+                defaults: vec![],
                 window: (Timestamp(1), Timestamp(6)),
                 seed: 0,
                 broker: "sim-optimal(pip_size=1.0)".to_string(),
@@ -654,7 +666,7 @@ mod tests {
         };
         assert_eq!(
             report.to_json(),
-            r#"{"manifest":{"commit":"abc123","params":[["sma_fast",{"I64":2}],["sma_slow",{"I64":4}],["bias_scale",{"F64":1.0}]],"window":[1,6],"seed":0,"broker":"sim-optimal(pip_size=1.0)"},"metrics":{"total_pips":12.0,"max_drawdown":1.0,"bias_sign_flips":1}}"#,
+            r#"{"manifest":{"commit":"abc123","params":[["sma_fast",{"I64":2}],["sma_slow",{"I64":4}],["bias_scale",{"F64":1.0}]],"defaults":[],"window":[1,6],"seed":0,"broker":"sim-optimal(pip_size=1.0)"},"metrics":{"total_pips":12.0,"max_drawdown":1.0,"bias_sign_flips":1}}"#,
         );
     }
 
@@ -669,6 +681,7 @@ mod tests {
                     ("sma_slow".to_string(), Scalar::i64(4)),
                     ("bias_scale".to_string(), Scalar::f64(1.0)),
                 ],
+                defaults: vec![],
                 window: (Timestamp(1), Timestamp(6)),
                 seed: 0,
                 broker: "sim-optimal(pip_size=1.0)".to_string(),
@@ -693,6 +706,7 @@ mod tests {
                     ("sma_slow".to_string(), Scalar::i64(4)),
                     ("bias_scale".to_string(), Scalar::f64(1.0)),
                 ],
+                defaults: vec![],
                 window: (Timestamp(1), Timestamp(6)),
                 seed: 0,
                 broker: "sim-optimal(pip_size=1.0)".to_string(),
diff --git a/crates/aura-engine/src/sweep.rs b/crates/aura-engine/src/sweep.rs
index 0a0c150..c348e1e 100644
--- a/crates/aura-engine/src/sweep.rs
+++ b/crates/aura-engine/src/sweep.rs
@@ -722,6 +722,7 @@ mod tests {
             manifest: RunManifest {
                 commit: "test".to_string(),
                 params: Vec::new(),
+                defaults: Vec::new(),
                 window: (Timestamp(0), Timestamp(0)),
                 seed: 0,
                 broker: "test".to_string(),
@@ -877,6 +878,7 @@ mod tests {
             manifest: RunManifest {
                 commit: point.iter().map(|c| c.i64().to_string()).collect::<Vec<_>>().join(","),
                 params: Vec::new(),
+                defaults: Vec::new(),
                 window: (Timestamp(0), Timestamp(0)),
                 seed: 0,
                 broker: "test".to_string(),
diff --git a/crates/aura-engine/src/walkforward.rs b/crates/aura-engine/src/walkforward.rs
index 7ca992c..baae39e 100644
--- a/crates/aura-engine/src/walkforward.rs
+++ b/crates/aura-engine/src/walkforward.rs
@@ -288,6 +288,7 @@ mod tests {
             manifest: RunManifest {
                 commit: "t".to_string(),
                 params: Vec::new(),
+                defaults: Vec::new(),
                 window: (Timestamp(0), Timestamp(0)),
                 seed: 0,
                 broker: "t".to_string(),
diff --git a/crates/aura-engine/tests/list_sweep_e2e.rs b/crates/aura-engine/tests/list_sweep_e2e.rs
index e57810a..4b342e5 100644
--- a/crates/aura-engine/tests/list_sweep_e2e.rs
+++ b/crates/aura-engine/tests/list_sweep_e2e.rs
@@ -99,6 +99,7 @@ fn run_point(point: &[Cell]) -> RunReport {
         manifest: RunManifest {
             commit: "list-sweep-e2e".to_string(),
             params: Vec::new(),
+            defaults: Vec::new(),
             window: (Timestamp(0), Timestamp(0)),
             seed: 0,
             broker: "test".to_string(),
diff --git a/crates/aura-engine/tests/random_sweep_e2e.rs b/crates/aura-engine/tests/random_sweep_e2e.rs
index 190b804..a4f5222 100644
--- a/crates/aura-engine/tests/random_sweep_e2e.rs
+++ b/crates/aura-engine/tests/random_sweep_e2e.rs
@@ -112,6 +112,7 @@ fn run_point(point: &[Cell]) -> RunReport {
         manifest: RunManifest {
             commit: "random-sweep-e2e".to_string(),
             params: Vec::new(),
+            defaults: Vec::new(),
             window: (Timestamp(0), Timestamp(0)),
             seed: 0,
             broker: "test".to_string(),
diff --git a/crates/aura-ingest/examples/ger40_breakout_sweep.rs b/crates/aura-ingest/examples/ger40_breakout_sweep.rs
index 43d634d..99a31d5 100644
--- a/crates/aura-ingest/examples/ger40_breakout_sweep.rs
+++ b/crates/aura-ingest/examples/ger40_breakout_sweep.rs
@@ -63,6 +63,7 @@ fn run_point(server: &Arc<DataServer>, point: &[Cell], from: Timestamp, to: Time
         manifest: RunManifest {
             commit: "ger40-breakout-sweep".to_string(),
             params: vec![],
+            defaults: vec![],
             window: (from, to),
             seed: 0,
             broker: "sim-optimal(pip_size=1)".to_string(),
diff --git a/crates/aura-ingest/examples/ger40_breakout_walkforward.rs b/crates/aura-ingest/examples/ger40_breakout_walkforward.rs
index 916c66d..3160ebc 100644
--- a/crates/aura-ingest/examples/ger40_breakout_walkforward.rs
+++ b/crates/aura-ingest/examples/ger40_breakout_walkforward.rs
@@ -73,6 +73,7 @@ fn run_point(
         manifest: RunManifest {
             commit: "ger40-breakout-wfo".to_string(),
             params: vec![],
+            defaults: vec![],
             window: (from, to),
             seed: 0,
             broker: "sim-optimal(pip_size=1)".to_string(),
diff --git a/crates/aura-ingest/examples/shared/breakout_real.rs b/crates/aura-ingest/examples/shared/breakout_real.rs
index 26f167d..46e546c 100644
--- a/crates/aura-ingest/examples/shared/breakout_real.rs
+++ b/crates/aura-ingest/examples/shared/breakout_real.rs
@@ -396,6 +396,7 @@ pub fn report_from_trace(trace: &[BarTrace], from: Timestamp, to: Timestamp) ->
                 ("entry_bar".to_string(), Scalar::i64(3)),
                 ("exit_bar".to_string(), Scalar::i64(5)),
             ],
+            defaults: vec![],
             window: (from, to),
             seed: 0,
             broker: "sim-optimal(pip_size=1)".to_string(),
diff --git a/crates/aura-ingest/tests/ger40_breakout_world.rs b/crates/aura-ingest/tests/ger40_breakout_world.rs
index fb6284f..651f017 100644
--- a/crates/aura-ingest/tests/ger40_breakout_world.rs
+++ b/crates/aura-ingest/tests/ger40_breakout_world.rs
@@ -65,6 +65,7 @@ fn run_point(server: &Arc<DataServer>, point: &[Cell], from: Timestamp, to: Time
         manifest: RunManifest {
             commit: "ger40-breakout-world".to_string(),
             params: vec![],
+            defaults: vec![],
             window: (from, to),
             seed: 0,
             broker: "sim-optimal(pip_size=1)".to_string(),
diff --git a/crates/aura-ingest/tests/real_bars.rs b/crates/aura-ingest/tests/real_bars.rs
index 9b057b7..2f36c58 100644
--- a/crates/aura-ingest/tests/real_bars.rs
+++ b/crates/aura-ingest/tests/real_bars.rs
@@ -86,6 +86,7 @@ fn run_sample_over(prices: Vec<(Timestamp, Scalar)>) -> RunReport {
                 ("sma_slow".to_string(), Scalar::i64(4)),
                 ("bias_scale".to_string(), Scalar::f64(0.5)),
             ],
+            defaults: vec![],
             window,
             seed: 0,
             broker: "sim-optimal(pip_size=0.0001)".to_string(),
diff --git a/crates/aura-ingest/tests/streaming_seam.rs b/crates/aura-ingest/tests/streaming_seam.rs
index a8b3083..2ddaefa 100644
--- a/crates/aura-ingest/tests/streaming_seam.rs
+++ b/crates/aura-ingest/tests/streaming_seam.rs
@@ -86,6 +86,7 @@ fn run_sample(window: (Timestamp, Timestamp), source: Box<dyn Source>) -> RunRep
                 ("sma_slow".to_string(), Scalar::i64(4)),
                 ("bias_scale".to_string(), Scalar::f64(0.5)),
             ],
+            defaults: vec![],
             window,
             seed: 0,
             broker: "sim-optimal(pip_size=0.0001)".to_string(),
diff --git a/crates/aura-registry/src/compat.rs b/crates/aura-registry/src/compat.rs
index c630609..8244033 100644
--- a/crates/aura-registry/src/compat.rs
+++ b/crates/aura-registry/src/compat.rs
@@ -29,6 +29,8 @@ pub(crate) struct RunReportRead {
 struct RunManifestRead {
     commit: String,
     params: Vec<(String, ScalarRead)>,
+    #[serde(default)]
+    defaults: Vec<(String, ScalarRead)>,
     window: (Timestamp, Timestamp),
     seed: u64,
     broker: String,
@@ -73,12 +75,14 @@ impl<'de> Deserialize<'de> for ScalarRead {
 impl From<RunReportRead> for RunReport {
     fn from(r: RunReportRead) -> Self {
         let RunManifestRead {
-            commit, params, window, seed, broker, selection, instrument, topology_hash, project,
+            commit, params, defaults, window, seed, broker, selection, instrument, topology_hash,
+            project,
         } = r.manifest;
         RunReport {
             manifest: RunManifest {
                 commit,
                 params: params.into_iter().map(|(name, v)| (name, v.0)).collect(),
+                defaults: defaults.into_iter().map(|(name, v)| (name, v.0)).collect(),
                 window,
                 seed,
                 broker,
diff --git a/crates/aura-registry/src/lib.rs b/crates/aura-registry/src/lib.rs
index 7493f30..22048d8 100644
--- a/crates/aura-registry/src/lib.rs
+++ b/crates/aura-registry/src/lib.rs
@@ -816,6 +816,7 @@ mod tests {
             manifest: RunManifest {
                 commit: "c".to_string(),
                 params: vec![("p".to_string(), Scalar::f64(1.0))],
+                defaults: vec![],
                 window: (Timestamp(1), Timestamp(2)),
                 seed: 0,
                 broker: "b".to_string(),
@@ -1182,7 +1183,7 @@ mod tests {
             params: vec![],
             report: RunReport {
                 manifest: RunManifest {
-                    commit: "c".into(), params: vec![], window: (Timestamp(0), Timestamp(0)),
+                    commit: "c".into(), params: vec![], defaults: vec![], window: (Timestamp(0), Timestamp(0)),
                     seed: 0, broker: "b".into(), selection: None, instrument: None,
                     topology_hash: None,
                     project: None,
diff --git a/crates/aura-registry/src/trace_store.rs b/crates/aura-registry/src/trace_store.rs
index 2c35a20..4bade17 100644
--- a/crates/aura-registry/src/trace_store.rs
+++ b/crates/aura-registry/src/trace_store.rs
@@ -299,6 +299,7 @@ mod tests {
         RunManifest {
             commit: "c".to_string(),
             params: vec![("p".to_string(), Scalar::f64(1.0))],
+            defaults: vec![],
             window: (Timestamp(1), Timestamp(5)),
             seed: 0,
             broker: "sim-optimal(pip_size=0.0001)".to_string(),
diff --git a/crates/aura-registry/tests/campaign_run_store_e2e.rs b/crates/aura-registry/tests/campaign_run_store_e2e.rs
index 02f2476..1cf01a8 100644
--- a/crates/aura-registry/tests/campaign_run_store_e2e.rs
+++ b/crates/aura-registry/tests/campaign_run_store_e2e.rs
@@ -30,6 +30,7 @@ fn tiny_report() -> RunReport {
         manifest: RunManifest {
             commit: "c".to_string(),
             params: vec![],
+            defaults: vec![],
             window: (Timestamp(1), Timestamp(2)),
             seed: 0,
             broker: "b".to_string(),
diff --git a/docs/design/INDEX.md b/docs/design/INDEX.md
index 082d371..7d2581a 100644
--- a/docs/design/INDEX.md
+++ b/docs/design/INDEX.md
@@ -1211,6 +1211,18 @@ every hand-rolled usage line reads `Usage: aura <verb> …` (#179, cycle 0101);
 refusal diagnostics stay unprefixed (diagnostics are not usage lines). The
 machine-first help surface (JSON/manifest help, stdin op-scripts) stays on the
 #157/C21 track, not this cycle (settled as human/GNU convention compliance).
+**Amendment (2026-07-13, #249 — two artifact classes, two redundancy budgets).**
+The data layer the programmatic face emits is a public interface read raw (by
+humans and LLMs), and its records split into two classes with opposite
+redundancy budgets: **generated outcome records** (manifests, metrics, family
+reports) have a single writer at run time — redundancy there cannot drift and
+is deliberately spent on direct readability; **authored intent artifacts**
+(blueprints, op-scripts, campaign documents) are author-maintained — every
+redundancy is a drift site and stays out. Consequence shipped with #249: a run
+manifest stamps the untouched bound defaults (`defaults`, one-directionally
+widened beside `params`, which keeps its "what varied" reproduce semantics) so
+a raw reader of a fully-bound run no longer sees a misleading `"params": []`;
+the blueprint itself carries no such duplication.
 
 ### C15 — Resampling-as-node; sessions/calendars
 **Guarantee.** A resampler is a node (finer stream → coarser bar stream),