Tier 1: chat quality — fuzzy aliases, reply templates, dedup, rewriter

Foco: matar repetición y adaptar respuestas. Los handlers tenían ~30 strings
hardcodeadas (3-7 lugares cada una). Aliases hacían substring exacto.

- pg_trgm + GIN indexes en product_aliases / alias_product_mappings.
  Captura plurales, diminutivos, typos sin reglas. catalogRetrieval re-busca
  el snapshot con normalized_alias cuando el query original no rinde
  (vasio→vacio→Vacío).
- reply_templates table + replyTemplates.js. 20 keys, 2-3 variantes c/u
  con DEFAULTS hardcodeados como fallback. pickVariant excluye las usadas
  en context.recent_replies (FIFO cap 8). Wired en idle/cart/cartHelpers/
  shipping/payment/waiting.
- failed_searches counter en context. count>=3 escala via humanFallback.
  Reset en cada add_to_cart exitoso.
- storeContext.js: vars derivadas de getStoreConfig (delivery_zones, hours,
  zonas) listas para inyectar en templates cuando los datos se carguen.
- replyRewriter.js: LLM call opcional (REPLY_REWRITER=1) que adapta el
  template al hilo conversacional. 1.5s timeout, fallback al template puro.
  Sólo activo en 8 slots semánticamente importantes.
- 12 unit tests para replyTemplates (rotation, recency, FIFO, vars).
  208 tests totales pasando.

Plan completo: ~/.claude/plans/ok-creo-que-tiene-humming-sutton.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/modules/2-identity/db/repo.js

@@ -535,32 +535,57 @@ export async function getDecryptedTenantEcommerceConfig({
   return rows[0] || null;
 }
 
-export async function searchProductAliases({ tenant_id, q = "", limit = 20 }) {
+export async function searchProductAliases({ tenant_id, q = "", limit = 20, threshold = 0.3 }) {
   const lim = Math.max(1, Math.min(200, parseInt(limit, 10) || 20));
   const query = String(q || "").trim();
   if (!query) return [];
   const normalized = query.toLowerCase();
-  const like = `%${query}%`;
-  const nlike = `%${normalized}%`;
   const sql = `
-    select tenant_id, alias, normalized_alias, woo_product_id, category_hint, boost, metadata, updated_at
+    select tenant_id, alias, normalized_alias, woo_product_id, category_hint, boost, metadata, updated_at,
+           greatest(similarity(alias, $2), similarity(normalized_alias, $3)) as sim
     from product_aliases
-    where tenant_id=$1
-      and (alias ilike $2 or normalized_alias ilike $3)
-    order by boost desc, updated_at desc
+    where tenant_id = $1
+      and (alias % $2 or normalized_alias % $3)
+    order by sim desc, boost desc, updated_at desc
     limit $4
   `;
-  const { rows } = await pool.query(sql, [tenant_id, like, nlike, lim]);
-  return rows.map((r) => ({
-    tenant_id: r.tenant_id,
-    alias: r.alias,
-    normalized_alias: r.normalized_alias,
-    woo_product_id: r.woo_product_id,
-    category_hint: r.category_hint,
-    boost: r.boost,
-    metadata: r.metadata,
-    updated_at: r.updated_at,
-  }));
+  const { rows } = await pool.query(sql, [tenant_id, query, normalized, lim]);
+  return rows
+    .filter((r) => Number(r.sim) >= threshold)
+    .map((r) => ({
+      tenant_id: r.tenant_id,
+      alias: r.alias,
+      normalized_alias: r.normalized_alias,
+      woo_product_id: r.woo_product_id,
+      category_hint: r.category_hint,
+      boost: r.boost,
+      metadata: r.metadata,
+      updated_at: r.updated_at,
+      similarity: Number(r.sim),
+    }));
+}
+
+export async function searchAliasProductMappings({ tenant_id, q = "", limit = 50, threshold = 0.3 }) {
+  const lim = Math.max(1, Math.min(200, parseInt(limit, 10) || 50));
+  const query = String(q || "").trim();
+  if (!query) return [];
+  const normalized = query.toLowerCase();
+  const sql = `
+    select alias, woo_product_id, score, similarity(alias, $2) as sim
+    from alias_product_mappings
+    where tenant_id = $1 and alias % $2
+    order by sim desc, score desc
+    limit $3
+  `;
+  const { rows } = await pool.query(sql, [tenant_id, normalized, lim]);
+  return rows
+    .filter((r) => Number(r.sim) >= threshold)
+    .map((r) => ({
+      alias: r.alias,
+      woo_product_id: Number(r.woo_product_id),
+      score: Number(r.score || 1),
+      similarity: Number(r.sim),
+    }));
 }
 
 export async function getRecoRules({ tenant_id }) {