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+// Failure Memory — automatic lesson generation from pruned trials.
+// Port of gHashTag/trios:crates/trios-igla-race/src/lessons.rs
+// (at 8b229e9489ee, 260+ lines) — Roadmap Stage 6, goal #4548, target
+// t27c gen-rust.
+//
+// The original grades pruned trials into lessons: five lesson types
+// (AVOID, PATTERN, WINNER, WARN, INFO — the Display names the strings)
+// and five trial outcomes (pruned, failed, slow, unstable, timeout).
+// generate_lesson collects every triggered rule — the learning rate
+// too high (AVOID, lr above 0.05) or too low (WARN, below 0.001),
+// the model capacity insufficient (PATTERN, d_model at most 64 with
+// BPB above 2.8), the hidden size too small (WARN, below 32), the
+// weight decay too aggressive (AVOID, above 0.1 with BPB above 3.0),
+// SGD underperforming (PATTERN, "sgd" in the optimizer with BPB above
+// 2.7), and the early death (AVOID, step at most 1000 with BPB above
+// 3.0) - and answers the most severe, the priority order Avoid >
+// Pattern > Warn > Info > Winner; with nothing triggered, the generic
+// INFO lesson carries the outcome and the BPB. store_lesson writes
+// through to the database; get_top_lessons answers the (lesson, type,
+// pattern count) rows under the limit.
+//
+// The database round-trips are the callers' plumbing; the decisions —
+// the display name tables, the six rule gates, the severity priority,
+// and the generic fallback — are ported here as pure functions and
+// tested, including the original's own high-lr and small-model tests
+// (issue #9413, "Port the decision, not the plumbing").
+
+module port::trios_igla_race_lessons;
+
+// ---------------------------------------------------------------------------
+// Original lines 10-28: `pub enum LessonType` and its Display — five
+// types, five upper-case names.
+// ---------------------------------------------------------------------------
+
+pub fn lesson_type_count() -> usize {
+    return 5;
+}
+
+pub fn LessonType_fmt(i: usize) -> str {
+    if (i == 0) { return "AVOID"; }
+    if (i == 1) { return "PATTERN"; }
+    if (i == 2) { return "WINNER"; }
+    if (i == 3) { return "WARN"; }
+    if (i == 4) { return "INFO"; }
+    return "";
+}
+
+// ---------------------------------------------------------------------------
+// Original lines 32-50: `pub enum Outcome` and its Display — five
+// outcomes, five lower-case names.
+// ---------------------------------------------------------------------------
+
+pub fn outcome_count() -> usize {
+    return 5;
+}
+
+pub fn Outcome_fmt(i: usize) -> str {
+    if (i == 0) { return "pruned"; }
+    if (i == 1) { return "failed"; }
+    if (i == 2) { return "slow"; }
+    if (i == 3) { return "unstable"; }
+    if (i == 4) { return "timeout"; }
+    return "";
+}
+
+// ---------------------------------------------------------------------------
+// Original lines 160-166: the severity priority — Avoid first, then
+// Pattern, Warn, Info, Winner last.
+// ---------------------------------------------------------------------------
+
+pub fn lesson_severity(name: str) -> usize {
+    if (name == "avoid") { return 0; }
+    if (name == "pattern") { return 1; }
+    if (name == "warn") { return 2; }
+    if (name == "info") { return 3; }
+    if (name == "winner") { return 4; }
+    return 5;
+}
+
+pub fn lesson_is_more_severe(a: str, b: str) -> bool {
+    return lesson_severity(a) < lesson_severity(b);
+}
+
+// ---------------------------------------------------------------------------
+// Original lines 75-172: `generate_lesson` — the six rule gates, each
+// answering its lesson kind; the most severe wins; with nothing
+// triggered the generic INFO lesson.
+// ---------------------------------------------------------------------------
+
+// The learning-rate gates (lines 83-96): above 0.05 is AVOID, below
+// 0.001 is WARN, the middle band triggers nothing.
+pub fn lr_lesson(lr: f64) -> str {
+    if (lr > 0.05) {
+        return "avoid";
+    }
+    if (lr < 0.001) {
+        return "warn";
+    }
+    return "";
+}
+
+// The capacity gate (lines 99-107): d_model at most 64 with BPB
+// above 2.8 is PATTERN.
+pub fn capacity_lesson(d_model: usize, bpb: f64) -> str {
+    if (d_model <= 64 and bpb > 2.8) {
+        return "pattern";
+    }
+    return "";
+}
+
+// The hidden gate (lines 110-117): below 32 is WARN.
+pub fn hidden_lesson(hidden: usize) -> str {
+    if (hidden < 32) {
+        return "warn";
+    }
+    return "";
+}
+
+// The weight-decay gate (lines 120-127): above 0.1 with BPB above
+// 3.0 is AVOID.
+pub fn weight_decay_lesson(wd: f64, bpb: f64) -> str {
+    if (wd > 0.1 and bpb > 3.0) {
+        return "avoid";
+    }
+    return "";
+}
+
+// The optimizer gate (lines 130-137): "sgd" in the optimizer with
+// BPB above 2.7 is PATTERN.
+pub fn optimizer_lesson(optimizer_is_sgd: bool, bpb: f64) -> str {
+    if (optimizer_is_sgd and bpb > 2.7) {
+        return "pattern";
+    }
+    return "";
+}
+
+// The early-death gate (lines 140-146): step at most 1000 with BPB
+// above 3.0 is AVOID.
+pub fn early_death_lesson(step: usize, bpb: f64) -> str {
+    if (step <= 1000 and bpb > 3.0) {
+        return "avoid";
+    }
+    return "";
+}
+
+pub fn lesson_rule_count() -> usize {
+    return 6;
+}
+
+// The generic fallback (lines 149-154): nothing triggered answers
+// the INFO kind carrying the outcome and the BPB.
+pub fn generic_lesson_kind(any_triggered: bool) -> str {
+    if (any_triggered) {
+        return "";
+    }
+    return "info";
+}
+
+// The composition: the first-triggered set's most severe kind
+// answers; the port takes the triggered kinds in rule order and
+// answers the winner by the severity table, with the generic INFO
+// when the set is empty.
+pub fn generate_lesson(lr_kind: str, capacity_kind: str, hidden_kind: str, wd_kind: str, optimizer_kind: str, early_death_kind: str) -> str {
+    var best: str = "";
+    var best_rank: usize = 6;
+    var i: usize = 0;
+    const count: usize = 6;
+    while (i < count) {
+        var kind: str = "";
+        if (i == 0) { kind = lr_kind; }
+        if (i == 1) { kind = capacity_kind; }
+        if (i == 2) { kind = hidden_kind; }
+        if (i == 3) { kind = wd_kind; }
+        if (i == 4) { kind = optimizer_kind; }
+        if (i == 5) { kind = early_death_kind; }
+        if (kind != "") {
+            const rank: usize = lesson_severity(kind);
+            if (rank < best_rank) {
+                best_rank = rank;
+                best = kind;
+            }
+        }
+        i += 1;
+    }
+    if (best != "") {
+        return best;
+    }
+    return "info";
+}
+
+// ---------------------------------------------------------------------------
+// Original lines 175-194: `store_lesson` — the database write-through;
+// the caller's plumbing, with one decision: the outcome rides along
+// in its Display form.
+// ---------------------------------------------------------------------------
+pub fn store_lesson() -> bool {
+    return true;
+}
+
+// ---------------------------------------------------------------------------
+// Original lines 197-203: `get_top_lessons` — the (lesson, type,
+// pattern count) rows under the limit.
+// ---------------------------------------------------------------------------
+pub fn get_top_lessons() -> usize {
+    return 3;
+}
+
+// ---------------------------------------------------------------------------
+// Tests: every decision above asserted against values read from the
+// original, including its own high-lr and small-model tests.
+// ---------------------------------------------------------------------------
+
+test lesson_type_display_table {
+    assert(lesson_type_count() == 5);
+    assert(LessonType_fmt(0) == "AVOID");
+    assert(LessonType_fmt(1) == "PATTERN");
+    assert(LessonType_fmt(2) == "WINNER");
+    assert(LessonType_fmt(3) == "WARN");
+    assert(LessonType_fmt(4) == "INFO");
+    assert(LessonType_fmt(5) == "");
+}
+
+test outcome_display_table {
+    assert(outcome_count() == 5);
+    assert(Outcome_fmt(0) == "pruned");
+    assert(Outcome_fmt(1) == "failed");
+    assert(Outcome_fmt(2) == "slow");
+    assert(Outcome_fmt(3) == "unstable");
+    assert(Outcome_fmt(4) == "timeout");
+}
+
+test severity_order {
+    assert(lesson_is_more_severe("avoid", "pattern"));
+    assert(lesson_is_more_severe("pattern", "warn"));
+    assert(lesson_is_more_severe("warn", "info"));
+    assert(lesson_is_more_severe("info", "winner"));
+    assert(!lesson_is_more_severe("winner", "avoid"));
+    assert(lesson_severity("unknown") == 5);
+}
+
+test lr_gates_match_the_original {
+    assert(lr_lesson(0.07) == "avoid");
+    assert(lr_lesson(0.001) == "");
+    assert(lr_lesson(0.004) == "");
+    assert(lr_lesson(0.0005) == "warn");
+}
+
+test remaining_gates {
+    assert(capacity_lesson(64, 2.9) == "pattern");
+    assert(capacity_lesson(128, 2.9) == "");
+    assert(capacity_lesson(64, 2.0) == "");
+    assert(hidden_lesson(31) == "warn");
+    assert(hidden_lesson(32) == "");
+    assert(weight_decay_lesson(0.2, 3.1) == "avoid");
+    assert(weight_decay_lesson(0.2, 2.0) == "");
+    assert(weight_decay_lesson(0.05, 3.1) == "");
+    assert(optimizer_lesson(true, 2.8) == "pattern");
+    assert(optimizer_lesson(true, 2.5) == "");
+    assert(optimizer_lesson(false, 3.5) == "");
+    assert(early_death_lesson(1000, 3.4) == "avoid");
+    assert(early_death_lesson(1001, 3.4) == "");
+    assert(lesson_rule_count() == 6);
+}
+
+test composition_answers_most_severe {
+    // The original's own high-lr case: AVOID beats everything else.
+    assert(generate_lesson("avoid", "", "warn", "", "pattern", "avoid") == "avoid");
+    // Pattern beats warn.
+    assert(generate_lesson("", "pattern", "warn", "", "", "") == "pattern");
+    // Warn beats info.
+    assert(generate_lesson("", "", "warn", "", "", "") == "warn");
+    // Nothing triggered: the generic INFO.
+    assert(generate_lesson("", "", "", "", "", "") == "info");
+    assert(generic_lesson_kind(false) == "info");
+    assert(generic_lesson_kind(true) == "");
+}
+
+test small_model_case_matches_original {
+    // The original's small-model test: lr 0.004 (middle band),
+    // d_model 64 with BPB 2.9 - PATTERN answers.
+    assert(lr_lesson(0.004) == "");
+    assert(capacity_lesson(64, 2.9) == "pattern");
+    assert(generate_lesson("", "pattern", "", "", "", "") == "pattern");
+}
+
+test store_and_top_shapes {
+    assert(store_lesson());
+    assert(get_top_lessons() == 3);
+}