fix(mnemopi): preserve small fact recall buckets

packages/mnemopi/src/core/beam/recall.ts

@@ -125,7 +125,7 @@ const FACT_QUERY_FILLER_WORDS = new Set([
 ]);
 
 const FACT_CLITIC_FRAGMENTS = new Set(["d", "ll", "m", "re", "s", "t", "ve"]);
-const FLAT_FACT_SEARCH_NOISE = new Set(["entity", "fact"]);
+const FLAT_FACT_SEARCH_NOISE: Record<string, true> = { entity: true, fact: true };
 
 function nowIso(): string {
 	return new Date().toISOString();
@@ -1032,7 +1032,7 @@ export async function recallEnhanced(
 function factRecallLimit(topK: number): number {
 	const requested = Math.max(0, Math.floor(topK));
 	if (requested === 0) return 0;
-	return Math.max(1, Math.ceil(requested / 2));
+	return Math.min(requested, Math.max(3, Math.ceil(requested / 2)));
 }
 
 function sandwichOrder(results: readonly RecallResult[]): {
@@ -1041,7 +1041,8 @@ function sandwichOrder(results: readonly RecallResult[]): {
 	closing: RecallResult[];
 } {
 	const scored = [...results].sort((left, right) => (right.score ?? 0) - (left.score ?? 0));
-	const high = scored.slice(0, 3);
+	const highLimit = scored.length > 0 && scored.length < 4 ? 1 : 3;
+	const high = scored.slice(0, highLimit);
 	const medium = scored.slice(high.length, high.length + 5);
 	const closing = scored.slice(high.length + medium.length, high.length + medium.length + 3);
 	return { high, medium, closing };
@@ -1051,7 +1052,7 @@ function factSearchableText(subject: string, predicate: string, object: string):
 	if (objectText.length === 0) return `${subject} ${predicate}`.trim();
 	const structuralParts = [subject, predicate].filter(part => {
 		const token = part.trim().toLowerCase();
-		return token.length > 0 && !FLAT_FACT_SEARCH_NOISE.has(token);
+		return token.length > 0 && FLAT_FACT_SEARCH_NOISE[token] !== true;
 	});
 	return [...structuralParts, objectText].join(" ").trim();
 }

packages/mnemopi/test/recall-precision-regressions.test.ts

@@ -169,6 +169,21 @@ describe("recall precision regressions", () => {
 		expect(new Set(bullets).size).toBe(bullets.length);
 	});
 
+	it("keeps small enhanced fact recalls filled and split into supporting context", async () => {
+		const beam = makeBeam();
+		const facts = ["redis alpha runs on port 6379", "redis beta handles failover"];
+		storeFactStrings(beam, facts, 0, "repro-source");
+
+		const results = await beam.recallEnhanced("redis", 2, { includeFacts: true });
+		const factContents = results.filter(result => result.tier === "fact").map(result => result.content);
+		expect(factContents.toSorted()).toEqual(facts.toSorted());
+
+		const context = beam.formatContext(results, "bullet");
+		expect(bulletLinesUnder(context, "## Top Facts")).toHaveLength(1);
+		expect(bulletLinesUnder(context, "## Supporting Context")).toHaveLength(1);
+		expect(context).not.toContain("## Recent Signals");
+	});
+
 	it("does not recall flat facts through storage-only fact/entity fields", () => {
 		const beam = makeBeam();
 		storeFactStrings(beam, ["redis cluster runs on port 6379"], 0, "repro-source");