docs: update CONTRIBUTING.md with branch, release, and API version reference table

Author: nrkruk

CONTRIBUTING.md

@@ -28,3 +28,32 @@ R2b Release
 
 - Create a [patch branch pull request](https://github.com/salesforcecli/plugin-lightning-dev/commit/150bcfa3036018ea49ab73da10d1b470cab0ad43).
 - Ensure this step completes successfully and has released a newly tagged "latest" version of the plugin to NPM.
+
+### Branch / Release / API Version Reference
+
+| Core Branch | Release Name | API Version |
+| ----------- | ------------ | ----------- |
+| 254-patch   | spring25     | 63          |
+| 256-patch   | summer25     | 64          |
+| 258-patch   | winter26     | 65          |
+| 260-patch   | spring26     | 66          |
+| 262-patch   | summer26     | 67          |
+| 264-patch   | winter27     | 68          |
+| 266-patch   | spring27     | 69          |
+| 268-patch   | summer27     | 70          |
+| 270-patch   | winter28     | 71          |
+| 272-patch   | spring28     | 72          |
+| 274-patch   | summer28     | 73          |
+| 276-patch   | winter29     | 74          |
+| 278-patch   | spring29     | 75          |
+| 280-patch   | summer29     | 76          |
+| 282-patch   | winter30     | 77          |
+| 284-patch   | spring30     | 78          |
+| 286-patch   | summer30     | 79          |
+| 288-patch   | winter31     | 80          |
+| 290-patch   | spring31     | 81          |
+| 292-patch   | summer31     | 82          |
+| 294-patch   | winter32     | 83          |
+| 296-patch   | spring32     | 84          |
+| 298-patch   | summer32     | 85          |
+| 300-patch   | winter33     | 86          |