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/models/workflow.go

@@ -38,6 +38,7 @@ type Workflow struct {
 type WorkflowPatch struct {
 	Name        *string          `json:"name,omitempty"`
 	Description *string          `json:"description,omitempty"`
+	TeamID      *string          `json:"team_id,omitempty"`
 	Branding    *json.RawMessage `json:"branding,omitempty"`
 	EntryMode   *string          `json:"entry_mode,omitempty"`
 	IsActive    *bool            `json:"is_active,omitempty"`