refactor(lsp,llm,hexailsp,appconfig): split long funcs; add tests

- Extract helpers to keep funcs <=50 lines; no behavior changes
- Add tests for prompt removal, code actions, and LLM request builders
- Table-drive TestInParamList; run gofmt

1 files changed, 15 insertions, 0 deletions

diff --git a/internal/llm/copilot_test.go b/internal/llm/copilot_test.go
new file mode 100644
index 0000000..5492713
--- /dev/null
+++ b/internal/llm/copilot_test.go
@@ -0,0 +1,15 @@
+package llm
+
+import "testing"
+
+func TestBuildCopilotChatRequest_FieldsAndDefaults(t *testing.T) {
+    o := Options{Model: "gpt-x", Temperature: 0, MaxTokens: 123, Stop: []string{"X"}}
+    msgs := []Message{{Role: "user", Content: "q"}}
+    req := buildCopilotChatRequest(o, msgs, f64p(0.5))
+    if req.Model != "gpt-x" { t.Fatalf("model mismatch: %q", req.Model) }
+    if req.Temperature == nil || *req.Temperature != 0.5 { t.Fatalf("default temp not applied") }
+    if req.MaxTokens == nil || *req.MaxTokens != 123 { t.Fatalf("max_tokens not applied") }
+    if len(req.Stop) != 1 || req.Stop[0] != "X" { t.Fatalf("stop not applied") }
+    if len(req.Messages) != 1 || req.Messages[0].Content != "q" { t.Fatalf("messages not copied") }
+}
+