Second-review loose end: the `webhook` node type passed validation but had no
registered handler → engine dispatched to registry.getAction('webhook') →
undefined → every run silently skipped. An enabled webhook flow no-op'd.
Register a real `webhook` action (covers both the webhook node type and the
"Call a webhook" action). It POSTs the run context to config.url, guarded by
validateExternalUrl — the same NAT64/private-range SSRF protection the webhook
delivery worker uses (GHSA-wmjx-pc37-272r) — with no redirects and a timeout,
unless WEBHOOK_ALLOW_PRIVATE_URLS=true (local-dev opt-out). Missing URL /
rejected URL / network error record an observable skipped step, not a crash.
So the action is now implemented → it passes the enable guard legitimately.
Test covers dry-run, missing-url, and metadata-IP (169.254.169.254) rejection.
Luca
af7eea8b43