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>

server/pages/templates/base.html

@@ -124,9 +124,20 @@
     {{if eq .Surface "team-admin"}}{{template "scripts-team-admin" .}}{{end}}
     {{if eq .Surface "settings"}}{{template "scripts-settings" .}}{{end}}
     {{if eq .Surface "welcome"}}{{template "scripts-welcome" .}}{{end}}
-    {{/* v0.27.0: Extension surface JS — loaded from /surfaces/{id}/js/main.js */}}
+    {{/* v0.27.0: Extension surface JS — load Preact globals, boot SDK, then extension */}}
     {{if and .Manifest (eq .Manifest.Source "extension")}}
-    <script type="module" nonce="{{.CSPNonce}}" src="{{.BasePath}}/surfaces/{{.Surface}}/js/main.js?v={{.Version}}"></script>
+    <script type="module" nonce="{{.CSPNonce}}">
+        const { h, render } = await import('{{.BasePath}}/js/sw/vendor/preact.module.js');
+        const hooksModule = await import('{{.BasePath}}/js/sw/vendor/hooks.module.js');
+        const { default: htm } = await import('{{.BasePath}}/js/sw/vendor/htm.module.js');
+        window.preact = window.preact || { h, render };
+        window.hooks = window.hooks || hooksModule;
+        window.html = window.html || htm.bind(h);
+
+        const { boot } = await import('{{.BasePath}}/js/sw/sdk/index.js?v={{.Version}}');
+        await boot();
+        await import('{{.BasePath}}/surfaces/{{.Surface}}/js/main.js?v={{.Version}}');
+    </script>
     {{end}}
 
     {{/* v0.37.13: Legacy UserMenu hydration removed — all surfaces use Preact UserMenu. */}}