fix(automations): order send_template params numerically, not lexicographically

Meta's template placeholders are positional ({{1}}, {{2}}, …). We
previously sorted the keys of step_config.variables lexicographically,
so a template with ≥10 variables got params in the order
"1", "10", "2", …, silently scrambling every render past the 9th
placeholder. Fix: sort numeric-looking keys by numeric value, fall back
to locale compare for non-numeric keys.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/automations/engine.ts

@@ -315,9 +315,22 @@ async function runStep(step: AutomationStep, args: ExecuteArgs): Promise<string>
       if (!args.contactId) throw new Error('send_template needs a contact')
       if (!cfg.template_name) throw new Error('send_template needs template_name')
       const conversationId = await resolveConversationId(args)
+      // Meta templates use positional {{1}}, {{2}}, … placeholders, so
+      // we MUST emit params in strict numeric order. Lexicographic sort
+      // of "1", "2", …, "10" yields "1", "10", "2", … which silently
+      // scrambles every template with ≥10 variables.
       const params = cfg.variables
         ? Object.keys(cfg.variables)
-            .sort()
+            .sort((a, b) => {
+              const na = Number(a)
+              const nb = Number(b)
+              const aNum = Number.isFinite(na)
+              const bNum = Number.isFinite(nb)
+              if (aNum && bNum) return na - nb
+              if (aNum) return -1
+              if (bNum) return 1
+              return a.localeCompare(b)
+            })
             .map((k) => String(cfg.variables![k]))
         : []
       const { whatsapp_message_id } = await engineSendTemplate({