refactor(fts): pool adapter calls loadFTSExtension, drop debug breadcrumb

Addresses PR #726 review feedback.

- pool-adapter.ts now calls loadFTSExtension(available[0]) in both
  initPool and initLbugWithDb instead of duplicating the LOAD/INSTALL
  try-catch chain.
- loadFTSExtension accepts an optional connection and returns a boolean
  so the pool adapter can track shared.ftsLoaded without replicating
  the error handling.
- Removed the console.debug breadcrumb per reviewer request.

gitnexus/src/core/lbug/lbug-adapter.ts

@@ -1144,29 +1144,41 @@ export const getEmbeddingTableName = (): string => EMBEDDING_TABLE_NAME;
 
 /**
  * Load the FTS extension (required before using FTS functions).
- * Safe to call multiple times — tracks loaded state via module-level ftsLoaded.
+ *
+ * Safe to call multiple times — when invoked without arguments, tracks loaded
+ * state via module-level `ftsLoaded`. When invoked with an explicit
+ * connection, loads on that connection and returns whether the load
+ * succeeded — letting callers (e.g. the pool adapter) track their own state.
+ *
+ * Tries `LOAD EXTENSION fts` first so previously-cached installs skip the
+ * network entirely; falls back to `INSTALL` + `LOAD` only when the extension
+ * hasn't been cached yet.
  */
-export const loadFTSExtension = async (): Promise<void> => {
-  if (ftsLoaded) return;
-  if (!conn) {
-    throw new Error('LadybugDB not initialized. Call initLbug first.');
+export const loadFTSExtension = async (targetConn?: lbug.Connection): Promise<boolean> => {
+  const useModuleState = targetConn === undefined;
+  if (useModuleState) {
+    if (ftsLoaded) return true;
+    if (!conn) {
+      throw new Error('LadybugDB not initialized. Call initLbug first.');
+    }
+    targetConn = conn;
   }
+
+  const markLoaded = (): true => {
+    if (useModuleState) ftsLoaded = true;
+    return true;
+  };
+
   try {
     // Try loading locally first (no network required)
-    await conn.query('LOAD EXTENSION fts');
-    ftsLoaded = true;
-  } catch (err: any) {
-    // Fall back to install + load (requires network).  Log a breadcrumb so
-    // cache corruption / version mismatches leave a diagnostic trail instead
-    // of a silent fall-through to the (slower, network-bound) INSTALL path.
-    console.debug(
-      'GitNexus: FTS LOAD from cache failed, will attempt INSTALL:',
-      err?.message || '',
-    );
+    await targetConn!.query('LOAD EXTENSION fts');
+    return markLoaded();
+  } catch {
+    // Fall back to install + load (requires network)
     try {
-      await conn.query('INSTALL fts');
-      await conn.query('LOAD EXTENSION fts');
-      ftsLoaded = true;
+      await targetConn!.query('INSTALL fts');
+      await targetConn!.query('LOAD EXTENSION fts');
+      return markLoaded();
     } catch (err: any) {
       const msg = err?.message || '';
       if (
@@ -1174,10 +1186,10 @@ export const loadFTSExtension = async (): Promise<void> => {
         msg.includes('already installed') ||
         msg.includes('already exists')
       ) {
-        ftsLoaded = true;
-      } else {
-        console.error('GitNexus: FTS extension load failed:', msg);
+        return markLoaded();
       }
+      console.error('GitNexus: FTS extension load failed:', msg);
+      return false;
     }
   }
 };

gitnexus/src/core/lbug/pool-adapter.ts

@@ -17,6 +17,7 @@
 
 import fs from 'fs/promises';
 import lbug from '@ladybugdb/core';
+import { loadFTSExtension } from './lbug-adapter.js';
 
 /** Per-repo pool: one Database, many Connections */
 interface PoolEntry {
@@ -354,19 +355,7 @@ async function doInitLbug(repoId: string, dbPath: string): Promise<void> {
   // Done BEFORE pool registration so no concurrent checkout can grab
   // the connection while the async FTS load is in progress.
   if (!shared.ftsLoaded) {
-    try {
-      await available[0].query('LOAD EXTENSION fts');
-      shared.ftsLoaded = true;
-    } catch {
-      // Extension not cached locally — try INSTALL (downloads from remote) then LOAD
-      try {
-        await available[0].query('INSTALL fts');
-        await available[0].query('LOAD EXTENSION fts');
-        shared.ftsLoaded = true;
-      } catch {
-        // FTS unavailable — queries will fail gracefully
-      }
-    }
+    shared.ftsLoaded = await loadFTSExtension(available[0]);
   }
 
   // Load VECTOR extension once per shared Database for semantic search support.
@@ -440,19 +429,7 @@ export async function initLbugWithDb(
 
   // Load FTS extension if not already loaded on this Database
   if (!shared.ftsLoaded) {
-    try {
-      await available[0].query('LOAD EXTENSION fts');
-      shared.ftsLoaded = true;
-    } catch {
-      // Extension not cached locally — try INSTALL (downloads from remote) then LOAD
-      try {
-        await available[0].query('INSTALL fts');
-        await available[0].query('LOAD EXTENSION fts');
-        shared.ftsLoaded = true;
-      } catch {
-        // FTS unavailable — queries will fail gracefully
-      }
-    }
+    shared.ftsLoaded = await loadFTSExtension(available[0]);
   }
 
   // Load VECTOR extension for semantic search support