0.5.0

Templates move from "renderer is usable but UI is a placeholder" to a
fully editable library. Outbound webhooks can now reference a template
by handle, so the same body lives in one place and updates propagate
to every hook that uses it.

Added

• [new] CRUD domain actions for templates: Create, Update, Delete.
  Delete detaches outbound webhooks that reference the template by
  handle so removing a library entry never silently disables a hook —
  the success notice surfaces the detach count to the operator.
• [new] TemplateRepository gains paginate(int, ?string $search, ?string $type),
  find(), findByUuid() to mirror the Outbound / Inbound / Rule
  repository surfaces.
• [new] Cp\TemplateController grows from listing-only to full CRUD
  (index/create/store/edit/update/destroy). Index supports search +
  type filter; edit screen lists the registered variable resolver
  namespaces inline so authors discover them without leaving the page.
• [new] Vue pages.
  • pages/templates/Index.vue — real list with search, type filter,
    and per-row edit links.
  • pages/templates/Edit.vue (new) — sectioned form (Identity / Body)
    plus a Preview panel that posts the current body to
    actions.preview-template and renders the result alongside any
    validation issues.
• [new] Outbound library reuse. New nullable column
  payload_template_handle on webhook_outbounds. When set, the
  HttpRequestFactory resolves the body from the referenced template
  instead of the inline payload_template. The body source is selected
  via a new "Inline template / Library template" radio in the
  Outbound edit panel.
• [new] Tests.
  • tests/Feature/TemplateCrudTest.php — Create / Update / Delete
    actions, default-handle slugification, detach behaviour on delete.
  • tests/Feature/OutboundUsesLibraryTemplateTest.php — body source
    precedence (library → inline → JSON event), missing-template fallback
    to inline, template-edit propagation to subsequent renders.
• [new] i18n. template_* notices for CRUD success messages plus a
  detach-count variant for the delete flow.
• [new] Routes. routes/cp.php adds the templates CRUD routes (the
  actions.preview-template route already existed).

Changed

• HttpRequestFactory now takes the TemplateRepository as a third
  constructor dependency and resolves the body in this order:
  payload_template_handle → payload_template → JSON-encoded
  TriggerEvent. The library handle wins when both are set so an operator
  can promote an inline body to a library entry without having to also
  clear the inline field on every hook.
• SaveOutboundWebhookRequest allows payload_template_handle
  (nullable, must exist in webhook_templates.handle) and skips inline-body
  validation when the hook delegates to a library template — that body
  is validated on the Template edit screen instead.

TODO: REVIEW

• A dangling payload_template_handle (where the referenced template
  was removed by a path that bypasses DeleteTemplateAction) silently
  falls back to the inline body. This keeps deliveries alive but hides
  the misconfiguration; classify as a configuration failure once the
  centralised observer mentioned in PRD §54 lands.
• The Edit screen's preview always uses source_type=entry. Future
  iteration: surface the four supported source types (entry / form /
  user / asset) so a notification template author can preview against
  the right resolver.