refactor(memory): drop unused host helpers

packages/memory-host-sdk/src/host/query-expansion.ts

@@ -799,34 +799,3 @@ export function expandQueryForFts(
 
   return { original, keywords, expanded };
 }
-
-/**
- * Type for an optional LLM-based query expander.
- * Can be provided to enhance keyword extraction with semantic understanding.
- */
-export type LlmQueryExpander = (query: string) => Promise<string[]>;
-
-/**
- * Expand query with optional LLM assistance.
- * Falls back to local extraction if LLM is unavailable or fails.
- */
-export async function expandQueryWithLlm(
-  query: string,
-  llmExpander?: LlmQueryExpander,
-  opts?: { ftsTokenizer?: "unicode61" | "trigram" },
-): Promise<string[]> {
-  // If LLM expander is provided, try it first
-  if (llmExpander) {
-    try {
-      const llmKeywords = await llmExpander(query);
-      if (llmKeywords.length > 0) {
-        return llmKeywords;
-      }
-    } catch {
-      // LLM failed, fall back to local extraction
-    }
-  }
-
-  // Fall back to local keyword extraction
-  return extractKeywords(query, opts);
-}

packages/memory-host-sdk/src/host/status-format.ts

@@ -42,11 +42,3 @@ export function resolveMemoryCacheSummary(cache: { enabled: boolean; entries?: n
   const suffix = typeof cache.entries === "number" ? ` (${cache.entries})` : "";
   return { tone: "ok", text: `cache on${suffix}` };
 }
-
-/** Resolve cache enabled state without count text. */
-export function resolveMemoryCacheState(cache: { enabled: boolean }): {
-  tone: Tone;
-  state: "enabled" | "disabled";
-} {
-  return cache.enabled ? { tone: "ok", state: "enabled" } : { tone: "muted", state: "disabled" };
-}