chore(changeset): patch for @objectstack/observability, whose re-anchored comment ships in dist

The rewritten SEMCONV comment reaches dist/index.js and dist/index.cjs
(one line each; both maps and both .d.ts unchanged). The verify rewrites
leave its dist byte-identical, so verify carries no changeset.

Claude-Session: https://claude.ai/code/session_01VvcEokUG1tvVxkceYfR5XB
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

.changeset/20594-observability-provenance-anchors.md

@@ -0,0 +1,11 @@
+---
+'@objectstack/observability': patch
+---
+
+A provenance comment in `@objectstack/observability` was re-anchored
+
+The `SEMCONV` comment beside the retired `http_request_errors_total` entry
+cited a tracker number that no longer resolves on GitHub. It now cites the
+commit in this repository's history that moved `http_request_duration_ms` to
+the transport seam. Comment only: no metric name, label, export, type or
+runtime behaviour changes.