internal/chartconfig: add claude and antigravity to gopls/client

This adds chart configuration for the gopls/client counters for
Claude Code ("claude") and Antigravity / Jetski ("antigravity").

[git-generate]
go generate ./internal/configgen

For golang/go#79713

Change-Id: I48a19a4e214837d16536013b888f90376a6a6964
Reviewed-on: https://go-review.googlesource.com/c/telemetry/+/788800
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Hongxiang Jiang <hxjiang@golang.org>
Reviewed-by: Hongxiang Jiang <hxjiang@golang.org>
diff --git a/config/config.json b/config/config.json
index c3448ac..6c2fc59 100644
--- a/config/config.json
+++ b/config/config.json
@@ -945,7 +945,7 @@
 			],
 			"Counters": [
 				{
-					"Name": "gopls/client:{vscode,vscodium,vscode-insiders,code-server,eglot,govim,neovim,coc.nvim,sublimetext,windsurf,cursor,helix,zed,other}",
+					"Name": "gopls/client:{vscode,vscodium,vscode-insiders,code-server,eglot,govim,neovim,coc.nvim,sublimetext,windsurf,cursor,helix,zed,claude,antigravity,other}",
 					"Rate": 1
 				},
 				{
diff --git a/internal/chartconfig/config.txt b/internal/chartconfig/config.txt
index f610e3f..2ba5210 100644
--- a/internal/chartconfig/config.txt
+++ b/internal/chartconfig/config.txt
@@ -2,12 +2,13 @@
 # For the chart config file format, see chartconfig.go.
 
 title: Editor Distribution
-counter: gopls/client:{vscode,vscodium,vscode-insiders,code-server,eglot,govim,neovim,coc.nvim,sublimetext,windsurf,cursor,helix,zed,other}
+counter: gopls/client:{vscode,vscodium,vscode-insiders,code-server,eglot,govim,neovim,coc.nvim,sublimetext,windsurf,cursor,helix,zed,claude,antigravity,other}
 description: measure editor distribution for gopls users.
 type: partition
 issue: https://go.dev/issue/61038
 issue: https://go.dev/issue/62214 # add vscode-insiders
 issue: https://go.dev/issue/74874 # add windsurf and cursor
+issue: https://go.dev/issue/79713 # add claude and antigravity
 program: golang.org/x/tools/gopls
 module: golang.org/x/tools/gopls
 version: v0.13.0 # temporarily back-version to demonstrate config generation.