[garethx]

Corrects 47 skills after re-reading each vendor's current docs for the webhook hub, plus their providers/*.yaml entries where needed.

Most changes are small and in prose: dashboard paths, retry and timeout facts, dedupe advice and event lists that had gone out of date or had no source. A few change example code:

• Mercury: secretKey is now secret, the field the API returns.
• Mautic: email_on_open handlers read stat.lead.id, because that event has no contact.
• Invoice Ninja: detectEntity no longer treats any body with transaction_reference as a payment, or any with contacts as a client.
• Sigfox: classifyCallback checks eventType first, so Event callbacks aren't labelled as errors.
• Autumn: customer.products.updated gets its own case.
• Smartsheet: examples no longer skip events when newWebhookStatus is set.
• Workspace ONE: examples store the raw body rather than reading fields the docs don't document.
• Ampersand: the Express example sets a 350kb body limit, because messages can exceed the default.

Every event name a handler switches on was checked against the vendor's docs.

Testing

scripts/validate-provider.sh passes for all 47 skills. Most example test suites weren't run, because their dependencies weren't installed, so please rely on CI for those.

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