chore: add change file for @rushstack/lookup-by-path minor bump

Agent-Logs-Url: https://github.com/microsoft/rushstack/sessions/a422a6e3-515f-4967-9ae3-eec7adf9edef

Co-authored-by: dmichon-msft <26827560+dmichon-msft@users.noreply.github.com>

Author: Copilot

common/changes/@rushstack/lookup-by-path/enhance-lookup-by-path-json-methods_2026-04-07-22-32.json

@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "comment": "Add toJson/fromJson methods for serialization/deserialization; use Object.create(null) for dictionary initialization",
+      "type": "minor",
+      "packageName": "@rushstack/lookup-by-path"
+    }
+  ],
+  "packageName": "@rushstack/lookup-by-path",
+  "email": "198982749+Copilot@users.noreply.github.com"
+}