Say which Go builds it

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/install.md

@@ -78,7 +78,7 @@ llmgw --version
 `CGO_ENABLED=0` deliberately, so a binary built today runs on a node whose libc
 is older than the builder's.
 
-To build instead of download, you need Go 1.26 or later and nothing else:
+To build instead of download, you need Go 1.26.6 or later and nothing else (an older Go fetches it itself):
 
 ```
 git clone https://gitea.mynodes.xyz/ilker/llmgw && cd llmgw

docs/quickstart.md

@@ -26,7 +26,7 @@ make test
 ./bin/llmgw --version
 ```
 
-`make build` writes `./bin/llmgw`. Go 1.26 or later is the only requirement.
+`make build` writes `./bin/llmgw`. Go 1.26.6 or later is the only requirement (an older Go fetches it itself).
 
 ## 2. Check the path with a fake engine