changeset: os lint stops warning on a declared webhook's label and description

The spec package ships liveness/, which the advisory lint reads, so the
re-grade publishes; a patch changeset for @objectstack/spec.

Claude-Session: https://claude.ai/code/session_01D6F9axfoPzR7t8G1J7Ytzz
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

.changeset/24900-webhook-label-description-live.md

@@ -0,0 +1,9 @@
+---
+'@objectstack/spec': patch
+---
+
+fix(spec): `os lint` no longer tells authors to remove a declared webhook's `label` or `description`
+
+Clause-②: no (a liveness-ledger re-grade: no schema, accept set, served body or error code moves; only the advisory `liveness-dead-property` warning on these two keys stops)
+
+The shipped liveness ledger (`liveness/webhook.json`) graded a declared webhook's `label` and `description` `dead` once the boot seeder that copied them into a `sys_webhook` row retired, and the advisory lint warned "Remove it" on every webhook that authored them. They are read: the Studio metadata list and quick-find show both keys, read off `GET /api/v1/meta/webhook`. Both rows are now `live`, so a declared webhook may keep its `label` and `description` and no warning is printed for them. Nothing else changes: the dispatcher still delivers on the same props as before.