feat: implement full scrip action engine with real executors

- SendEmail: real nodemailer transport with SMTP config, dynamic recipient resolution
  (static + ticket creator/owner lookup), Handlebars template support
- Webhook: HTTP POST/any method with configurable headers and JSON body
- FetchMetadata: external HTTP fetch, Handlebars URL/body templating,
  auto-adds result as comment/correspondence on ticket
- RunScript: arbitrary async JS execution with helpers (addComment,
  createTransaction, updateTicket, touchTicket), ticket context, and
  Drizzle ORM access
- SetCustomField: lookup by id/key/name, clear+insert value, record
  CustomFieldChange transaction
- CreateTransaction: insert arbitrary transaction record
- Add OnCustomFieldChange condition
- Pass condition_config to evaluator in engine

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/scrip/engine.ts

@@ -4,7 +4,7 @@ import type { Transaction } from '../models/transaction.ts';
 import { tickets, queues, scrips, lifecycles, customFieldValues, customFields } from '../db/schema.ts';
 import { eq, asc, inArray } from 'drizzle-orm';
 import { getConditionEvaluator } from './conditions.ts';
-import type { ConditionEvaluateContext } from './conditions.ts';
+import type { ConditionConfig, ConditionEvaluateContext } from './conditions.ts';
 import { getActionExecutor } from './actions.ts';
 import type { ActionPayload } from './actions.ts';
 import { TemplateRenderer } from './templates.ts';
@@ -103,7 +103,12 @@ export class ScripEngine {
         continue;
       }
 
-      if (!evaluator.evaluate(ticketRecord as unknown as Ticket, transactions, conditionContext)) {
+      if (!evaluator.evaluate(
+        ticketRecord as unknown as Ticket,
+        transactions,
+        conditionContext,
+        scrip.condition_config as ConditionConfig,
+      )) {
         continue;
       }