fix(mail-templates): run under Riposte's exec() runner (1.0.1)

The runner execs a script without __file__ or __name__: the Test button
failed on __file__ and render-mail-template never reached main(). The
test no longer imports the renderer, and the renderer calls main()
unconditionally like the other integrations.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BJu1jvaug4qY1kMgz8wx41

integrations/mail-templates/manifest.yaml

@@ -1,8 +1,8 @@
 id: mail_templates
 name: Mail Templates (ACKnowledge)
-version: 1.0.0
+version: 1.0.1
 description: "Turns a subject and a markdown description into an ACKnowledge SOC email (dark theme, header badge, signature with the logo, footer) — nothing is sent: chain the output into exchange-send-mail or mail-sender (`subject` → subject, `html_body` → html_body, `text_body` → body). Eight templates, each with its own badge and colour: sla_breach, incident_notification (colour follows `severity`), incident_update, incident_closure, action_required, escalation, threat_bulletin, info. The description takes markdown: headings (## is the blue capitalised section title), bold, italic, links, lists, quotes, rules, GFM tables, `code` and ``` blocks (hashes, IPs, command lines), and level pills `{{critical}}` `{{high}}` `{{medium}}` `{{low}}` `{{info}}` `{{ok}}` — `{{high:Élevée}}` changes the label. Raw HTML in the inputs is escaped, so alert data can be interpolated safely. The logo is an inline data-URI PNG: exchange-send-mail and mail-sender embed it; the Gmail integration does not, and the logo is lost there. No connection, no secret; stdlib-only."
-changelog: "1.0.0 — Initial release: render-mail-template (8 templates, markdown description with tables, code and level pills, optional callout, action button, case reference and severity, SOC or client footer, French or English) and a self-test."
+changelog: "1.0.1 — The Test button failed (NameError: __file__) and render-mail-template printed nothing: Riposte runs a script with exec(), without __file__ or __name__. The test no longer imports the renderer and the renderer runs main() unconditionally. | 1.0.0 — Initial release: render-mail-template (8 templates, markdown description with tables, code and level pills, optional callout, action button, case reference and severity, SOC or client footer, French or English) and a self-test."
 category: email
 
 # Nothing to connect to. The only setting names the bot in the SOC footer
@@ -61,7 +61,7 @@ commands:
 
   - id: test_connection
     name: mail-templates-test
-    description: "Render every template with a sample description, without sending anything (used by the Test button)."
+    description: "Check the integration is installed and list its templates; nothing to connect to (used by the Test button)."
     risk: read
     inputs_schema:
       properties: {}