Ember for Miner UI 4 (0.3.16): card.tune_floor (the chosen clock is the ladder's floor), persisted as CardPref.sweep_floor

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

app/igneum-app/src/config.rs

@@ -39,6 +39,9 @@ pub struct CardPref {
     pub sweep_class: String,
     #[serde(default)]
     pub sweep_source: String,
+    /// the chosen clock sat on the ladder's floor (the lowest step measured, not the optimum)
+    #[serde(default)]
+    pub sweep_floor: bool,
     /// Miner UI 4 (6 October 2026): this card's goal (efficiency | balanced | rate); empty = the global tune_goal
     #[serde(default)]
     pub tune_goal: String,

app/igneum-app/src/engine.rs

@@ -2858,6 +2858,10 @@ impl Engine {
             e.sweep_mhs = row.mhs;
             e.sweep_clock_mhz = row.point.clock_mhz;
             e.sweep_mem_mhz = row.point.mem_mhz;
+            // Miner UI 4: the row's sub-line reads "(the ladder's floor)" when the chosen clock is the lowest step
+            let floor_point = row.point.clock_mhz > 0 && row.point.clock_mhz <= run.plan.limits.clock_floor();
+            e.sweep_floor = floor_point;
+            c.tune_floor = floor_point;
             e.sweep_driver = c.driver.clone();
             e.sweep_class = c.program_class.clone();
             e.sweep_source = kind.name().into();

app/igneum-app/src/hotplug.rs

@@ -170,6 +170,7 @@ pub fn apply_pref(c: &mut CardState, p: &CardPref) {
     c.tune_goal = p.tune_goal.clone();
     c.tune_before_watts = p.sweep_before_watts;
     c.tune_before_mhs = p.sweep_before_mhs;
+    c.tune_floor = p.sweep_floor;
     if p.sweep_mhs > 0.0 && p.sweep_watts > 0.0 {
         c.tune_line = crate::ember::tuned_line(p.sweep_mhs, p.sweep_watts, p.sweep_eff);
     }

app/igneum-app/src/state.rs

@@ -129,6 +129,7 @@ pub struct CardState {
     pub tune_goal: String,     // this card's goal override (efficiency | balanced | rate); "" = the global goal
     pub tune_before_watts: f64, // the untuned point of the last full plan (step 0); 0 = never measured
     pub tune_before_mhs: f64,
+    pub tune_floor: bool,      // the chosen clock is the ladder's floor (the row's sub-line says so)
     // a tune in progress on this card, by this engine or by a measurement engine posting /api/tune-progress
     // (the project lead, 6 October 2026: "don't we need to show in the app that tuning is in progress?")
     pub tune_step: u32,

docs/plans/ember-tune.md

@@ -318,7 +318,7 @@ For 0.3.16 (Miner UI 4's Cards tab, Ember as its second layer), on ember-tune pa
 
 | Commit | What | Where |
 |---|---|---|
-| (past 7fadd4c) | a per-card goal: `POST /api/tune/goal {key, goal}` (efficiency, balanced, rate; "" or "global" clears), persisted as `CardPref.tune_goal`, echoed as `card.tune_goal` ("" = the global goal), resolved at the tune's start (`ember::goal_for`); the untuned point of the last full plan on the row: `card.tune_before_watts`, `card.tune_before_mhs` (its step 0, kept across confirm plans; `CardPref.sweep_before_*`), so the row can read "saves 84 W, 0.15% of rate" against `sweep_watts` / `sweep_mhs`; Retune = `POST /api/sweep/start {key}` (forced: clears a back-off since 0.3.15) | ember.rs, engine.rs, server.rs, config.rs, state.rs, hotplug.rs + test |
+| (past 7fadd4c) | a per-card goal: `POST /api/tune/goal {key, goal}` (efficiency, balanced, rate; "" or "global" clears), persisted as `CardPref.tune_goal`, echoed as `card.tune_goal` ("" = the global goal), resolved at the tune's start (`ember::goal_for`); `card.tune_floor` (the chosen clock is the ladder's floor; `CardPref.sweep_floor`); the untuned point of the last full plan on the row: `card.tune_before_watts`, `card.tune_before_mhs` (its step 0, kept across confirm plans; `CardPref.sweep_before_*`), so the row can read "saves 84 W, 0.15% of rate" against `sweep_watts` / `sweep_mhs`; Retune = `POST /api/sweep/start {key}` (forced: clears a back-off since 0.3.15) | ember.rs, engine.rs, server.rs, config.rs, state.rs, hotplug.rs + test |
 
 For the 0.3.15 cut (6 October 2026 evening), on ember-tune: