Feat v0.3.6 demo workflows + interactive demo

Four example workflow packages proving the engine end-to-end:
- Bug Report Triage: public entry, branch routing, SLA timer
- Employee Onboarding: Starlark automated stages, signoff gate
- Content Approval: multi-party signoff, revision cycle loop
- Webhook Notifier: http.post, connections fallback, delivery logging

Demo surface at /s/workflow-demo with cards, stage diagrams, Starlark
viewer, API examples, active/published status, and copyable public links.

Engine fixes: started_by in automated context, sla_seconds in package
installer, parseSnapshotStages for wrapped/legacy formats.

Platform fixes: extension SDK boot in base.html (Preact globals + boot()),
admin teams paginated response extraction, workflow adoption endpoint
(POST /teams/:teamId/workflows/:id/adopt), team-admin copyable link.

Review pass remains on roadmap for remaining UI polish.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/workflow-demo/manifest.json

@@ -0,0 +1,15 @@
+{
+  "id": "workflow-demo",
+  "title": "Workflow Demo",
+  "type": "full",
+  "version": "0.1.0",
+  "tier": "browser",
+  "icon": "🎓",
+  "author": "Switchboard Core",
+  "description": "Interactive demo surface for example workflow packages. Cards, stage diagrams, and API walkthroughs.",
+  "route": "/s/workflow-demo",
+  "auth": "authenticated",
+  "layout": "single",
+  "permissions": [],
+  "hooks": ["surface"]
+}