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* feat(triggers): add GitLab, PagerDuty, and Zendesk webhook triggers Add webhook trigger support for three integrations that previously had blocks but no triggers: - GitLab: push, merge request, issue, pipeline, comment, and all-events. Verifies the X-Gitlab-Token secret token; filters by object_kind. - PagerDuty: incident triggered/acknowledged/resolved/escalated/reassigned and all-events. Verifies X-PagerDuty-Signature (HMAC-SHA256 over raw body, comma-separated rotation); idempotency on event id. - Zendesk: ticket created/status changed/comment added/priority changed and all-events. Verifies X-Zendesk-Webhook-Signature (base64 HMAC-SHA256 over timestamp+body); idempotency on event id. Register GitLab's X-Gitlab-Event-UUID delivery header for webhook idempotency dedup. * fix(triggers): scope webhook secrets to owner and add Zendesk replay protection Address review feedback: - Add paramVisibility: 'user-only' to the webhookSecret fields for GitLab, PagerDuty, and Zendesk so signing secrets are scoped to the credential owner and not exposed to workspace collaborators (repo convention). - Reject Zendesk deliveries whose signed timestamp is more than 5 minutes from now, closing a replay window once an event id ages out of the idempotency cache. The X-Zendesk-Webhook-Signature-Timestamp header is ISO-8601, so it is parsed with Date.parse (matches the Slack handler's skew-check convention). * feat(triggers): auto-register GitLab, PagerDuty, and Zendesk webhooks Replace the manual-registration model with automatic webhook creation on deploy and cleanup on undeploy, via createSubscription/deleteSubscription on each provider handler: - GitLab: POST /projects/:id/hooks with a Personal Access Token; generates the secret token (stored for X-Gitlab-Token verification) and enables only the event flags for the selected trigger. Deletes the hook on undeploy. - PagerDuty: POST /webhook_subscriptions (account-scoped) with a REST API key; captures delivery_method.secret (returned only on create) for X-PagerDuty-Signature verification. Deletes the subscription on undeploy. - Zendesk: POST /api/v2/webhooks with native event subscriptions, then GET /webhooks/:id/signing_secret for X-Zendesk-Webhook-Signature verification. Deletes the webhook on undeploy. Trigger config now collects the provider credentials (user-only) instead of a pasted signing secret; the signing secret is generated or fetched and stored in providerConfig by the orchestration layer (no route/deploy changes). * fix(triggers): fail closed on missing webhook secret and clean up Zendesk orphans Address review feedback on the auto-registration changes: - verifyAuth now rejects (401) when webhookSecret is absent for GitLab, PagerDuty, and Zendesk. Since the secret is generated/fetched during auto-registration and stored before the webhook can receive deliveries, a missing secret indicates misconfiguration and must fail closed rather than skip signature verification. Adds an opt-in requireSecret flag to createHmacVerifier (default off, preserving behavior for other providers). - Zendesk createSubscription now deletes the just-created webhook if the follow-up signing-secret fetch fails, avoiding an orphaned subscription in Zendesk when setup cannot complete. * fix(triggers): clean up GitLab and PagerDuty webhooks on failed setup Extend the orphan-prevention fix to the remaining providers. When a create call succeeds but post-create validation fails, the created webhook is now deleted before throwing: - GitLab: if the create response can't be parsed for its hook id, the hook is located by its URL and deleted. - PagerDuty: if the subscription response lacks an id or signing secret, the subscription is deleted (by id when known, otherwise located by URL). Both cleanups are best-effort and never throw. * docs(triggers): note GitLab tag_push only flows through the all-events trigger