Add queue tables, quote SQL identifiers (v1.3.0)

- isQueue table option adds queue columns and a (status, available_at)
  index; BunSQLite.queue exposes add, claim, complete, fail and
  release_stale with atomic claims
- Set busy_timeout on connections so workers in separate processes wait
  instead of failing with SQLITE_BUSY
- Quote table and column names with backticks in generated SQL, so
  reserved words (to, order, group) work and unknown columns error
  instead of matching as string literals
- Tests for queue ops, multi-process claims and reserved-word names

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/utils/sql-generator-grab-concat-str.ts

@@ -1,6 +1,9 @@
-import { sqlField, sqlIdent, sqlStringLiteral } from "./sql-safe";
+import { sqlName, sqlStringLiteral } from "./sql-safe";
 
 type Param = {
+    /**
+     * An already validated and quoted column reference
+     */
     field: string;
     alias: string;
     separator?: string;
@@ -19,14 +22,14 @@ export default function sqlGenGrabConcatStr({
         gc += `DISTINCT `;
     }
 
-    gc += sqlField(field);
+    gc += field;
 
     if (!distinct) {
         gc += `, ${sqlStringLiteral(String(separator))}`;
     }
 
     gc += `)`;
-    gc += ` AS ${sqlIdent(alias, "alias")}`;
+    gc += ` AS ${sqlName(alias, "alias")}`;
 
     return gc;
 }