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(...))

cmd/review-bot/main.go

@@ -1,12 +1,14 @@
 package main
 
 import (
+	"context"
 	"flag"
 	"fmt"
 	"log"
 	"os"
 	"strconv"
 	"strings"
+	"time"
 
 	"gitea.weiker.me/rodin/review-bot/gitea"
 	"gitea.weiker.me/rodin/review-bot/llm"
@@ -64,17 +66,21 @@ func main() {
 		llmClient.WithTemperature(*llmTemp)
 	}
 
+	// Create a top-level context with a 3-minute timeout for all operations
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Minute)
+	defer cancel()
+
 	log.Printf("Reviewing PR #%d on %s/%s", prNumber, owner, repoName)
 
 	// Step 1: Fetch PR metadata
-	pr, err := giteaClient.GetPullRequest(owner, repoName, prNumber)
+	pr, err := giteaClient.GetPullRequest(ctx, owner, repoName, prNumber)
 	if err != nil {
 		log.Fatalf("Failed to fetch PR: %v", err)
 	}
 	log.Printf("PR: %s", pr.Title)
 
 	// Step 2: Fetch diff
-	diff, err := giteaClient.GetPullRequestDiff(owner, repoName, prNumber)
+	diff, err := giteaClient.GetPullRequestDiff(ctx, owner, repoName, prNumber)
 	if err != nil {
 		log.Fatalf("Failed to fetch diff: %v", err)
 	}
@@ -82,11 +88,11 @@ func main() {
 
 	// Step 3: Fetch full file content for modified files
 	fileContext := ""
-	files, err := giteaClient.GetPullRequestFiles(owner, repoName, prNumber)
+	files, err := giteaClient.GetPullRequestFiles(ctx, owner, repoName, prNumber)
 	if err != nil {
 		log.Printf("Warning: could not fetch PR files list: %v", err)
 	} else {
-		fileContext = fetchFileContext(giteaClient, owner, repoName, pr.Head.Ref, files)
+		fileContext = fetchFileContext(ctx, giteaClient, owner, repoName, pr.Head.Ref, files)
 		log.Printf("Fetched full context for %d files", len(files))
 	}
 
@@ -94,7 +100,7 @@ func main() {
 	ciPassed := true
 	ciDetails := ""
 	if pr.Head.Sha != "" {
-		statuses, err := giteaClient.GetCommitStatuses(owner, repoName, pr.Head.Sha)
+		statuses, err := giteaClient.GetCommitStatuses(ctx, owner, repoName, pr.Head.Sha)
 		if err != nil {
 			log.Printf("Warning: could not fetch CI status: %v", err)
 		} else {
@@ -106,7 +112,7 @@ func main() {
 	// Step 5: Load conventions file if specified
 	conventions := ""
 	if *conventionsFile != "" {
-		content, err := giteaClient.GetFileContent(owner, repoName, *conventionsFile)
+		content, err := giteaClient.GetFileContent(ctx, owner, repoName, *conventionsFile)
 		if err != nil {
 			log.Printf("Warning: could not load conventions file %q: %v", *conventionsFile, err)
 		} else {
@@ -118,7 +124,7 @@ func main() {
 	// Step 6: Load patterns from external repo if specified
 	patterns := ""
 	if *patternsRepo != "" {
-		patterns = fetchPatterns(giteaClient, *patternsRepo, *patternsFiles)
+		patterns = fetchPatterns(ctx, giteaClient, *patternsRepo, *patternsFiles)
 		log.Printf("Loaded patterns from %s (%d bytes)", *patternsRepo, len(patterns))
 	}
 
@@ -133,7 +139,7 @@ func main() {
 		{Role: "user", Content: userPrompt},
 	}
 
-	response, err := llmClient.Complete(messages)
+	response, err := llmClient.Complete(ctx, messages)
 	if err != nil {
 		log.Fatalf("LLM request failed: %v", err)
 	}
@@ -158,20 +164,20 @@ func main() {
 	}
 
 	log.Printf("Posting review (event=%s)...", event)
-	if err := giteaClient.PostReview(owner, repoName, prNumber, event, reviewBody); err != nil {
+	if err := giteaClient.PostReview(ctx, owner, repoName, prNumber, event, reviewBody); err != nil {
 		log.Fatalf("Failed to post review: %v", err)
 	}
 	log.Printf("Review posted successfully!")
 }
 
 // fetchFileContext fetches the full content of modified files from the PR branch.
-func fetchFileContext(client *gitea.Client, owner, repo, ref string, files []gitea.ChangedFile) string {
+func fetchFileContext(ctx context.Context, client *gitea.Client, owner, repo, ref string, files []gitea.ChangedFile) string {
 	var sb strings.Builder
 	for _, f := range files {
 		if f.Status == "removed" {
 			continue // Skip deleted files
 		}
-		content, err := client.GetFileContentRef(owner, repo, f.Filename, ref)
+		content, err := client.GetFileContentRef(ctx, owner, repo, f.Filename, ref)
 		if err != nil {
 			log.Printf("Warning: could not fetch %s: %v", f.Filename, err)
 			continue
@@ -188,7 +194,7 @@ func fetchFileContext(client *gitea.Client, owner, repo, ref string, files []git
 // patternsRepo is comma-separated list of owner/name repos.
 // patternsFiles is comma-separated list of file paths or directories.
 // If a path ends with / or is a directory, all files within it are fetched recursively.
-func fetchPatterns(client *gitea.Client, patternsRepo, patternsFiles string) string {
+func fetchPatterns(ctx context.Context, client *gitea.Client, patternsRepo, patternsFiles string) string {
 	var sb strings.Builder
 
 	repos := strings.Split(patternsRepo, ",")
@@ -212,7 +218,7 @@ func fetchPatterns(client *gitea.Client, patternsRepo, patternsFiles string) str
 				continue
 			}
 
-			files, err := client.GetAllFilesInPath(owner, repo, path)
+			files, err := client.GetAllFilesInPath(ctx, owner, repo, path)
 			if err != nil {
 				log.Printf("Warning: could not fetch %s from %s: %v", path, repoRef, err)
 				continue

gitea/client.go

@@ -1,6 +1,8 @@
 package gitea
 
 import (
+	"bytes"
+	"context"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -10,17 +12,17 @@ import (
 
 // Client interacts with the Gitea API.
 type Client struct {
-	BaseURL string
-	Token   string
-	HTTP    *http.Client
+	baseURL string
+	token   string
+	http    *http.Client
 }
 
 // NewClient creates a new Gitea API client.
 func NewClient(baseURL, token string) *Client {
 	return &Client{
-		BaseURL: strings.TrimRight(baseURL, "/"),
-		Token:   token,
-		HTTP:    &http.Client{},
+		baseURL: strings.TrimRight(baseURL, "/"),
+		token:   token,
+		http:    &http.Client{},
 	}
 }
 
@@ -49,9 +51,9 @@ type ChangedFile struct {
 }
 
 // GetPullRequest fetches PR metadata.
-func (c *Client) GetPullRequest(owner, repo string, number int) (*PullRequest, error) {
-	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d", c.BaseURL, owner, repo, number)
-	body, err := c.doGet(url)
+func (c *Client) GetPullRequest(ctx context.Context, owner, repo string, number int) (*PullRequest, error) {
+	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d", c.baseURL, owner, repo, number)
+	body, err := c.doGet(ctx, url)
 	if err != nil {
 		return nil, fmt.Errorf("fetch PR: %w", err)
 	}
@@ -63,9 +65,9 @@ func (c *Client) GetPullRequest(owner, repo string, number int) (*PullRequest, e
 }
 
 // GetPullRequestDiff fetches the unified diff for a PR.
-func (c *Client) GetPullRequestDiff(owner, repo string, number int) (string, error) {
-	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d.diff", c.BaseURL, owner, repo, number)
-	body, err := c.doGet(url)
+func (c *Client) GetPullRequestDiff(ctx context.Context, owner, repo string, number int) (string, error) {
+	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d.diff", c.baseURL, owner, repo, number)
+	body, err := c.doGet(ctx, url)
 	if err != nil {
 		return "", fmt.Errorf("fetch diff: %w", err)
 	}
@@ -73,9 +75,9 @@ func (c *Client) GetPullRequestDiff(owner, repo string, number int) (string, err
 }
 
 // GetPullRequestFiles fetches the list of files changed in a PR.
-func (c *Client) GetPullRequestFiles(owner, repo string, number int) ([]ChangedFile, error) {
-	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/files", c.BaseURL, owner, repo, number)
-	body, err := c.doGet(url)
+func (c *Client) GetPullRequestFiles(ctx context.Context, owner, repo string, number int) ([]ChangedFile, error) {
+	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/files", c.baseURL, owner, repo, number)
+	body, err := c.doGet(ctx, url)
 	if err != nil {
 		return nil, fmt.Errorf("fetch PR files: %w", err)
 	}
@@ -87,9 +89,9 @@ func (c *Client) GetPullRequestFiles(owner, repo string, number int) ([]ChangedF
 }
 
 // GetCommitStatuses fetches CI statuses for a commit SHA.
-func (c *Client) GetCommitStatuses(owner, repo, sha string) ([]CommitStatus, error) {
-	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/commits/%s/statuses", c.BaseURL, owner, repo, sha)
-	body, err := c.doGet(url)
+func (c *Client) GetCommitStatuses(ctx context.Context, owner, repo, sha string) ([]CommitStatus, error) {
+	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/commits/%s/statuses", c.baseURL, owner, repo, sha)
+	body, err := c.doGet(ctx, url)
 	if err != nil {
 		return nil, fmt.Errorf("fetch commit statuses: %w", err)
 	}
@@ -101,9 +103,9 @@ func (c *Client) GetCommitStatuses(owner, repo, sha string) ([]CommitStatus, err
 }
 
 // GetFileContent fetches a file from the default branch of a repo.
-func (c *Client) GetFileContent(owner, repo, filepath string) (string, error) {
-	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/raw/%s", c.BaseURL, owner, repo, filepath)
-	body, err := c.doGet(url)
+func (c *Client) GetFileContent(ctx context.Context, owner, repo, filepath string) (string, error) {
+	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/raw/%s", c.baseURL, owner, repo, filepath)
+	body, err := c.doGet(ctx, url)
 	if err != nil {
 		return "", fmt.Errorf("fetch file %s: %w", filepath, err)
 	}
@@ -111,9 +113,9 @@ func (c *Client) GetFileContent(owner, repo, filepath string) (string, error) {
 }
 
 // GetFileContentRef fetches a file from a specific ref (branch/tag/sha) in a repo.
-func (c *Client) GetFileContentRef(owner, repo, filepath, ref string) (string, error) {
-	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/raw/%s?ref=%s", c.BaseURL, owner, repo, filepath, ref)
-	body, err := c.doGet(url)
+func (c *Client) GetFileContentRef(ctx context.Context, owner, repo, filepath, ref string) (string, error) {
+	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/raw/%s?ref=%s", c.baseURL, owner, repo, filepath, ref)
+	body, err := c.doGet(ctx, url)
 	if err != nil {
 		return "", fmt.Errorf("fetch file %s@%s: %w", filepath, ref, err)
 	}
@@ -122,8 +124,8 @@ func (c *Client) GetFileContentRef(owner, repo, filepath, ref string) (string, e
 
 // PostReview submits a review to a PR.
 // event should be "APPROVED" or "REQUEST_CHANGES".
-func (c *Client) PostReview(owner, repo string, number int, event, body string) error {
-	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/reviews", c.BaseURL, owner, repo, number)
+func (c *Client) PostReview(ctx context.Context, owner, repo string, number int, event, body string) error {
+	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/reviews", c.baseURL, owner, repo, number)
 
 	payload := struct {
 		Body  string `json:"body"`
@@ -138,14 +140,14 @@ func (c *Client) PostReview(owner, repo string, number int, event, body string)
 		return fmt.Errorf("marshal review payload: %w", err)
 	}
 
-	req, err := http.NewRequest("POST", url, strings.NewReader(string(data)))
+	req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewReader(data))
 	if err != nil {
 		return fmt.Errorf("create review request: %w", err)
 	}
-	req.Header.Set("Authorization", "token "+c.Token)
+	req.Header.Set("Authorization", "token "+c.token)
 	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("post review: %w", err)
 	}
@@ -158,14 +160,14 @@ func (c *Client) PostReview(owner, repo string, number int, event, body string)
 	return nil
 }
 
-func (c *Client) doGet(url string) ([]byte, error) {
-	req, err := http.NewRequest("GET", url, nil)
+func (c *Client) doGet(ctx context.Context, url string) ([]byte, error) {
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
 	if err != nil {
 		return nil, err
 	}
-	req.Header.Set("Authorization", "token "+c.Token)
+	req.Header.Set("Authorization", "token "+c.token)
 
-	resp, err := c.HTTP.Do(req)
+	resp, err := c.http.Do(req)
 	if err != nil {
 		return nil, err
 	}
@@ -186,9 +188,9 @@ type ContentEntry struct {
 }
 
 // ListContents lists files and directories at a given path in a repo.
-func (c *Client) ListContents(owner, repo, path string) ([]ContentEntry, error) {
-	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/contents/%s", c.BaseURL, owner, repo, path)
-	body, err := c.doGet(url)
+func (c *Client) ListContents(ctx context.Context, owner, repo, path string) ([]ContentEntry, error) {
+	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/contents/%s", c.baseURL, owner, repo, path)
+	body, err := c.doGet(ctx, url)
 	if err != nil {
 		return nil, fmt.Errorf("list contents %s: %w", path, err)
 	}
@@ -202,14 +204,14 @@ func (c *Client) ListContents(owner, repo, path string) ([]ContentEntry, error)
 // GetAllFilesInPath recursively fetches all file contents under a path.
 // If the path is a file, returns just that file's content.
 // If the path is a directory, recursively fetches all files within it.
-func (c *Client) GetAllFilesInPath(owner, repo, path string) (map[string]string, error) {
+func (c *Client) GetAllFilesInPath(ctx context.Context, owner, repo, path string) (map[string]string, error) {
 	results := make(map[string]string)
 
 	// Try listing as directory first
-	entries, err := c.ListContents(owner, repo, path)
+	entries, err := c.ListContents(ctx, owner, repo, path)
 	if err != nil {
 		// Might be a file, try fetching directly
-		content, fileErr := c.GetFileContent(owner, repo, path)
+		content, fileErr := c.GetFileContent(ctx, owner, repo, path)
 		if fileErr != nil {
 			return nil, fmt.Errorf("path %q is neither a file nor directory: %w", path, err)
 		}
@@ -220,13 +222,13 @@ func (c *Client) GetAllFilesInPath(owner, repo, path string) (map[string]string,
 	for _, entry := range entries {
 		switch entry.Type {
 		case "file":
-			content, err := c.GetFileContent(owner, repo, entry.Path)
+			content, err := c.GetFileContent(ctx, owner, repo, entry.Path)
 			if err != nil {
 				continue // Skip files we can't read
 			}
 			results[entry.Path] = content
 		case "dir":
-			subResults, err := c.GetAllFilesInPath(owner, repo, entry.Path)
+			subResults, err := c.GetAllFilesInPath(ctx, owner, repo, entry.Path)
 			if err != nil {
 				continue
 			}

gitea/client_test.go

@@ -1,6 +1,7 @@
 package gitea
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"net/http"
@@ -28,7 +29,7 @@ func TestGetPullRequest(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	got, err := client.GetPullRequest("owner", "repo", 1)
+	got, err := client.GetPullRequest(context.Background(), "owner", "repo", 1)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -55,7 +56,7 @@ func TestGetPullRequestDiff(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	got, err := client.GetPullRequestDiff("owner", "repo", 5)
+	got, err := client.GetPullRequestDiff(context.Background(), "owner", "repo", 5)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -80,7 +81,7 @@ func TestGetCommitStatuses(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	got, err := client.GetCommitStatuses("owner", "repo", "abc123")
+	got, err := client.GetCommitStatuses(context.Background(), "owner", "repo", "abc123")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -127,7 +128,7 @@ func TestPostReview(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	err := client.PostReview("owner", "repo", 3, "APPROVED", "LGTM")
+	err := client.PostReview(context.Background(), "owner", "repo", 3, "APPROVED", "LGTM")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -141,7 +142,7 @@ func TestGetPullRequest_Non200(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	_, err := client.GetPullRequest("owner", "repo", 999)
+	_, err := client.GetPullRequest(context.Background(), "owner", "repo", 999)
 	if err == nil {
 		t.Fatal("expected error for 404, got nil")
 	}
@@ -154,7 +155,7 @@ func TestGetPullRequest_BadJSON(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	_, err := client.GetPullRequest("owner", "repo", 1)
+	_, err := client.GetPullRequest(context.Background(), "owner", "repo", 1)
 	if err == nil {
 		t.Fatal("expected error for bad JSON, got nil")
 	}
@@ -168,7 +169,7 @@ func TestPostReview_Non200(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	err := client.PostReview("owner", "repo", 1, "APPROVED", "test")
+	err := client.PostReview(context.Background(), "owner", "repo", 1, "APPROVED", "test")
 	if err == nil {
 		t.Fatal("expected error for 403, got nil")
 	}
@@ -186,7 +187,7 @@ func TestGetFileContent(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	got, err := client.GetFileContent("owner", "repo", "CONVENTIONS.md")
+	got, err := client.GetFileContent(context.Background(), "owner", "repo", "CONVENTIONS.md")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -206,7 +207,7 @@ func TestGetPullRequestFiles(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	files, err := client.GetPullRequestFiles("owner", "repo", 1)
+	files, err := client.GetPullRequestFiles(context.Background(), "owner", "repo", 1)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -231,7 +232,7 @@ func TestGetFileContentRef(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	content, err := client.GetFileContentRef("owner", "repo", "main.go", "feature-branch")
+	content, err := client.GetFileContentRef(context.Background(), "owner", "repo", "main.go", "feature-branch")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -251,7 +252,7 @@ func TestListContents(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	entries, err := client.ListContents("owner", "repo", "docs")
+	entries, err := client.ListContents(context.Background(), "owner", "repo", "docs")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -282,7 +283,7 @@ func TestGetAllFilesInPath_File(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	files, err := client.GetAllFilesInPath("owner", "repo", "README.md")
+	files, err := client.GetAllFilesInPath(context.Background(), "owner", "repo", "README.md")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}

integration_test.go

@@ -3,6 +3,7 @@
 package main
 
 import (
+	"context"
 	"os"
 	"strconv"
 	"testing"
@@ -44,7 +45,7 @@ func TestIntegration_FullReviewFlow(t *testing.T) {
 	// Parse owner/repo
 	owner, repoName := "", ""
 	for i, c := range giteaRepo {
-		if c == / {
+		if c == '/' {
 			owner = giteaRepo[:i]
 			repoName = giteaRepo[i+1:]
 			break
@@ -54,16 +55,18 @@ func TestIntegration_FullReviewFlow(t *testing.T) {
 		t.Fatalf("Invalid repo format %q", giteaRepo)
 	}
 
+	ctx := context.Background()
+
 	// Step 1: Fetch PR
 	giteaClient := gitea.NewClient(giteaURL, giteaToken)
-	pr, err := giteaClient.GetPullRequest(owner, repoName, prNumber)
+	pr, err := giteaClient.GetPullRequest(ctx, owner, repoName, prNumber)
 	if err != nil {
 		t.Fatalf("GetPullRequest: %v", err)
 	}
 	t.Logf("PR: %s (sha: %s)", pr.Title, pr.Head.Sha)
 
 	// Step 2: Fetch diff
-	diff, err := giteaClient.GetPullRequestDiff(owner, repoName, prNumber)
+	diff, err := giteaClient.GetPullRequestDiff(ctx, owner, repoName, prNumber)
 	if err != nil {
 		t.Fatalf("GetPullRequestDiff: %v", err)
 	}
@@ -78,7 +81,7 @@ func TestIntegration_FullReviewFlow(t *testing.T) {
 
 	// Step 4: Call LLM
 	llmClient := llm.NewClient(llmBaseURL, llmAPIKey, llmModel)
-	response, err := llmClient.Complete([]llm.Message{
+	response, err := llmClient.Complete(ctx, []llm.Message{
 		{Role: "system", Content: systemPrompt},
 		{Role: "user", Content: userPrompt},
 	})

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)
 	}