feat: add context.Context + unexport client fields

REVIEW.md findings 1-4, 14:
- All Gitea client methods now accept context.Context as first param
- All LLM client methods now accept context.Context as first param
- Use http.NewRequestWithContext for cancellation/timeout support
- Main uses 3-minute timeout context for all operations
- Unexport Client struct fields (baseURL, token, apiKey, etc.)
- Use bytes.NewReader instead of strings.NewReader(string(...))

llm/client.go

@@ -2,6 +2,7 @@ package llm
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -11,26 +12,26 @@ import (
 
 // Client calls an OpenAI-compatible chat completion API.
 type Client struct {
-	BaseURL string
-	APIKey  string
-	Model   string
-	Temperature float64
-	HTTP    *http.Client
+	baseURL     string
+	apiKey      string
+	model       string
+	temperature float64
+	http        *http.Client
 }
 
 // NewClient creates a new LLM client.
 func NewClient(baseURL, apiKey, model string) *Client {
 	return &Client{
-		BaseURL: strings.TrimRight(baseURL, "/"),
-		APIKey:  apiKey,
-		Model:   model,
-		HTTP:    &http.Client{},
+		baseURL: strings.TrimRight(baseURL, "/"),
+		apiKey:  apiKey,
+		model:   model,
+		http:    &http.Client{},
 	}
 }
 
 // WithTemperature sets the temperature for LLM requests (0 = omit, uses server default).
 func (c *Client) WithTemperature(t float64) *Client {
-	c.Temperature = t
+	c.temperature = t
 	return c
 }
 
@@ -57,12 +58,11 @@ type ChatResponse struct {
 }
 
 // Complete sends a chat completion request and returns the assistant's response content.
-func (c *Client) Complete(messages []Message) (string, error) {
+func (c *Client) Complete(ctx context.Context, messages []Message) (string, error) {
 	reqBody := ChatRequest{
-		Model:       c.Model,
-		Temperature: c.Temperature,
+		Model:       c.model,
+		Temperature: c.temperature,
 		Messages:    messages,
-		
 	}
 
 	data, err := json.Marshal(reqBody)
@@ -70,15 +70,15 @@ func (c *Client) Complete(messages []Message) (string, error) {
 		return "", fmt.Errorf("marshal request: %w", err)
 	}
 
-	url := c.BaseURL + "/chat/completions"
-	req, err := http.NewRequest("POST", url, bytes.NewReader(data))
+	url := c.baseURL + "/chat/completions"
+	req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewReader(data))
 	if err != nil {
 		return "", fmt.Errorf("create request: %w", err)
 	}
-	req.Header.Set("Authorization", "Bearer "+c.APIKey)
+	req.Header.Set("Authorization", "Bearer "+c.apiKey)
 	req.Header.Set("Content-Type", "application/json")
 
-	resp, err := c.HTTP.Do(req)
+	resp, err := c.http.Do(req)
 	if err != nil {
 		return "", fmt.Errorf("LLM request: %w", err)
 	}

llm/client_test.go

@@ -1,6 +1,7 @@
 package llm
 
 import (
+	"context"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -51,7 +52,7 @@ func TestComplete_Success(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-key", "gpt-4")
-	got, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	got, err := client.Complete(context.Background(), []Message{{Role: "user", Content: "Hi"}})
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -68,7 +69,7 @@ func TestComplete_APIError(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-key", "gpt-4")
-	_, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	_, err := client.Complete(context.Background(), []Message{{Role: "user", Content: "Hi"}})
 	if err == nil {
 		t.Fatal("expected error for 429, got nil")
 	}
@@ -82,7 +83,7 @@ func TestComplete_NoChoices(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-key", "gpt-4")
-	_, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	_, err := client.Complete(context.Background(), []Message{{Role: "user", Content: "Hi"}})
 	if err == nil {
 		t.Fatal("expected error for no choices, got nil")
 	}
@@ -95,7 +96,7 @@ func TestComplete_BadJSON(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-key", "gpt-4")
-	_, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	_, err := client.Complete(context.Background(), []Message{{Role: "user", Content: "Hi"}})
 	if err == nil {
 		t.Fatal("expected error for bad JSON, got nil")
 	}
@@ -103,7 +104,7 @@ func TestComplete_BadJSON(t *testing.T) {
 
 func TestComplete_ServerDown(t *testing.T) {
 	client := NewClient("http://127.0.0.1:1", "test-key", "gpt-4")
-	_, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	_, err := client.Complete(context.Background(), []Message{{Role: "user", Content: "Hi"}})
 	if err == nil {
 		t.Fatal("expected error for connection refused, got nil")
 	}
@@ -111,16 +112,16 @@ func TestComplete_ServerDown(t *testing.T) {
 
 func TestWithTemperature(t *testing.T) {
 	client := NewClient("http://example.com", "key", "model")
-	if client.Temperature != 0 {
-		t.Errorf("expected initial temperature 0, got %f", client.Temperature)
+	if client.temperature != 0 {
+		t.Errorf("expected initial temperature 0, got %f", client.temperature)
 	}
 
 	result := client.WithTemperature(0.7)
 	if result != client {
 		t.Error("WithTemperature should return the same client for chaining")
 	}
-	if client.Temperature != 0.7 {
-		t.Errorf("expected temperature 0.7, got %f", client.Temperature)
+	if client.temperature != 0.7 {
+		t.Errorf("expected temperature 0.7, got %f", client.temperature)
 	}
 }
 
@@ -147,7 +148,7 @@ func TestComplete_TemperatureOmittedWhenZero(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "key", "model")
-	_, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	_, err := client.Complete(context.Background(), []Message{{Role: "user", Content: "Hi"}})
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -180,7 +181,7 @@ func TestComplete_TemperatureIncludedWhenSet(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "key", "model").WithTemperature(0.7)
-	_, err := client.Complete([]Message{{Role: "user", Content: "Hi"}})
+	_, err := client.Complete(context.Background(), []Message{{Role: "user", Content: "Hi"}})
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}