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/employee-onboarding/script.star

@@ -0,0 +1,49 @@
+def on_provision(ctx):
+    """Automated provisioning: record in ext_data, notify HR."""
+    data = ctx["stage_data"]
+    name = data.get("full_name", "unknown")
+    dept = data.get("department", "general")
+
+    # Record provision in ext_data table
+    db.insert("provisions", {
+        "employee_name": name,
+        "department": dept,
+        "needs_vpn": str(data.get("needs_vpn", "false")),
+        "needs_admin": str(data.get("needs_admin", "false")),
+        "equipment": data.get("equipment", "standard laptop"),
+        "status": "provisioned",
+    })
+
+    # Notify the HR user who started this workflow
+    notifications.send(
+        ctx["started_by"],
+        "Accounts provisioned for " + name,
+        "Department: " + dept + ". Ready for manager review.",
+    )
+
+    return {"advance": True, "data": {
+        "provision_status": "complete",
+        "provisioned_for": name,
+    }}
+
+
+def on_welcome(ctx):
+    """Completion logging: record onboarding and send welcome."""
+    data = ctx["stage_data"]
+    name = data.get("full_name", "")
+    dept = data.get("department", "")
+
+    db.insert("onboarding_log", {
+        "employee_name": name,
+        "department": dept,
+        "completed_by": ctx["started_by"],
+        "status": "complete",
+    })
+
+    notifications.send(
+        ctx["started_by"],
+        "Onboarding complete: " + name,
+        "All stages finished. Welcome aboard!",
+    )
+
+    return {"advance": True, "data": {"onboarding_complete": True}}