chore: changeset for the liveness hint never showing the ledger note

Claude-Session: https://claude.ai/code/session_01VDtqoecgES7ScQYGbFVDRv
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

.changeset/21096-liveness-hint-never-note.md

@@ -0,0 +1,7 @@
+---
+'@objectstack/lint': patch
+---
+
+fix(lint): a liveness finding's fix text is the row's `authorHint`, else the verdict's default hint, and never the row's internal ledger `note`, for every row class. Before this, a row that opted in with `authorWarn`, and an `experimental` row, with no `authorHint` printed its `note` as the fix text: on `app-showcase`, the two `liveness-planned-property` findings for `externalSharingModel` printed a 728-character maintainer note that cites a tracker id. They now print "Keep it — a consumer is being built against this property; it has no runtime effect yet." No rule id, message, severity or exit code changes, and a row that has an `authorHint` prints it exactly as before (#21096)
+
+Clause-②: no