chore: add changeset for the flow-trigger-unknown-event lint rule

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018939yJ413zG3irLzcTtqaa

Author: claude

.changeset/flow-trigger-unknown-event-lint.md

@@ -0,0 +1,13 @@
+---
+"@objectstack/lint": minor
+---
+
+feat(lint): flag never-firing record trigger tokens at authoring time (#3427)
+
+New `flow-trigger-unknown-event` rule in `validateFlowTriggerReadiness`: a flow
+start node whose `triggerType` is record-lifecycle-shaped
+(`record-before|after-<op>`) but names an op the record-change trigger cannot map
+— e.g. a typo like `record-after-updated` — binds to the record-change trigger
+yet maps to no ObjectQL hook and never fires, with only a runtime warning. The
+rule surfaces that never-fire defect at `os validate` time. Warning severity;
+bare `record-<noun>` shapes (e.g. `record-change`) are out of scope.