swap .claude permissions from Go tooling to Dart + Flutter

Go sidecar is retired (ADR 0005). The matching Claude-Code allow list
still permitted `go`, `golangci-lint`, `goreleaser`, `govulncheck`,
`npm` — none of which are used anymore. Narrow the allow list to the
commands that actually run in this project.

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/settings.json

@@ -3,12 +3,9 @@
     "allow": [
       "Bash(git add *)",
       "Bash(git commit *)",
-      "Bash(go *)",
+      "Bash(dart *)",
-      "Bash(make *)",
+      "Bash(flutter *)",
-      "Bash(golangci-lint *)",
+      "Bash(make *)"
-      "Bash(goreleaser *)",
-      "Bash(govulncheck *)",
-      "Bash(npm *)"
     ],
     "deny": [
       "Bash(rm -rf /*)",