add changelog entries

Author: RodgeFu

.chronus/changes/tel-improve-compiler-2026-6-1-19-0-0.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/compiler"
+---
+
+Wrapped LSP server handlers with `wrapUnhandledError` to preserve server-side stack traces in error messages forwarded to the client. Previously, the JSON-RPC layer discarded the original stack trace, making unhandled errors in telemetry opaque.

.chronus/changes/tel-improve-vscode-2026-6-1-19-0-0.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "typespec-vscode"
+---
+
+Improved telemetry instrumentation for `install-global-compiler-cli`, `preview-openapi3`, `start-server`, and `server-path-changed` events by adding missing `lastStep` tracking and error detail logging. Added actionable error message when compiler is found but neither `node` nor `tsp` is available on PATH, guiding users to fix common nvm/fnm/volta configuration issues.