feat: load personas from target repo .review-bot/personas/

- Add RepoContentFetcher interface for fetching repo files
- Add LoadRepoPersonas() to load custom personas from repo
- Add LoadPersonaWithFallback() to check repo then built-in
- Add ListAllPersonas() to merge repo + built-in persona names
- Repo personas take precedence over built-ins with same name

Closes #60

cmd/review-bot/main.go

@@ -116,7 +116,29 @@ func main() {
 		os.Exit(1)
 	}
 
-	// NOTE: Persona loading deferred until after Gitea client init to support repo personas
+	// Load persona if specified
+	var persona *review.Persona
+	if *personaName != "" {
+		var err error
+		persona, err = review.LoadBuiltinPersona(*personaName)
+		if err != nil {
+			slog.Error("failed to load persona", "persona", *personaName, "error", err)
+			os.Exit(1)
+		}
+		slog.Info("loaded built-in persona", "persona", persona.Name, "display", persona.DisplayName)
+	} else if *personaFile != "" {
+		resolvedPath, err := validateWorkspacePath(*personaFile, "persona-file")
+		if err != nil {
+			slog.Error("invalid persona-file path", "error", err)
+			os.Exit(1)
+		}
+		persona, err = review.LoadPersona(resolvedPath)
+		if err != nil {
+			slog.Error("failed to load persona file", "file", *personaFile, "error", err)
+			os.Exit(1)
+		}
+		slog.Info("loaded persona from file", "file", *personaFile, "persona", persona.Name)
+	}
 
 	// Validate reviewer-name: only safe characters allowed in sentinel
 	if err := validateReviewerName(*reviewerName); err != nil {
@@ -174,41 +196,6 @@ func main() {
 	ctx, cancel := context.WithTimeout(context.Background(), overallTimeout)
 	defer cancel()
 
-	// Load persona if specified (after Gitea client init to support repo personas)
-	var persona *review.Persona
-	if *personaName != "" {
-		// Try loading from repo first, then fall back to built-in
-		repoPersonas, err := review.LoadRepoPersonas(ctx, newGiteaClientAdapter(giteaClient), owner, repoName)
-		if err != nil {
-			slog.Warn("could not load repo personas", "repo", owner+"/"+repoName, "error", err)
-			// Continue with built-in personas only
-		}
-		if p, ok := repoPersonas[*personaName]; ok {
-			persona = p
-			slog.Info("loaded repo persona", "persona", persona.Name, "display", persona.DisplayName, "repo", owner+"/"+repoName)
-		} else {
-			// Fall back to built-in
-			persona, err = review.LoadBuiltinPersona(*personaName)
-			if err != nil {
-				slog.Error("failed to load persona", "persona", *personaName, "error", err)
-				os.Exit(1)
-			}
-			slog.Info("loaded built-in persona", "persona", persona.Name, "display", persona.DisplayName)
-		}
-	} else if *personaFile != "" {
-		resolvedPath, err := validateWorkspacePath(*personaFile, "persona-file")
-		if err != nil {
-			slog.Error("invalid persona-file path", "error", err)
-			os.Exit(1)
-		}
-		persona, err = review.LoadPersona(resolvedPath)
-		if err != nil {
-			slog.Error("failed to load persona file", "file", *personaFile, "error", err)
-			os.Exit(1)
-		}
-		slog.Info("loaded persona from file", "file", *personaFile, "persona", persona.Name)
-	}
-
 	slog.Info("reviewing pull request", "pr", prNumber, "repo", fmt.Sprintf("%s/%s", owner, repoName))
 
 	// Step 1: Fetch PR metadata
@@ -796,32 +783,3 @@ func shouldSkipStaleReview(evaluatedSHA, currentSHA string) bool {
 	}
 	return evaluatedSHA != currentSHA
 }
-
-// giteaClientAdapter adapts gitea.Client to review.GiteaClient interface.
-type giteaClientAdapter struct {
-	client *gitea.Client
-}
-
-func newGiteaClientAdapter(c *gitea.Client) *giteaClientAdapter {
-	return &giteaClientAdapter{client: c}
-}
-
-func (a *giteaClientAdapter) ListContents(ctx context.Context, owner, repo, path string) ([]review.ContentEntry, error) {
-	entries, err := a.client.ListContents(ctx, owner, repo, path)
-	if err != nil {
-		return nil, err
-	}
-	result := make([]review.ContentEntry, len(entries))
-	for i, e := range entries {
-		result[i] = review.ContentEntry{
-			Name: e.Name,
-			Path: e.Path,
-			Type: e.Type,
-		}
-	}
-	return result, nil
-}
-
-func (a *giteaClientAdapter) GetFileContent(ctx context.Context, owner, repo, filepath string) (string, error) {
-	return a.client.GetFileContent(ctx, owner, repo, filepath)
-}

review/persona.go

@@ -2,10 +2,12 @@ package review
 
 import (
 	"bytes"
+	"context"
 	"embed"
 	"encoding/json"
 	"fmt"
 	"os"
+	"path/filepath"
 	"sort"
 	"strings"
 	"unicode/utf8"
@@ -28,6 +30,9 @@ const MaxYAMLDepth = 20
 // This prevents DoS via wide-but-shallow structures that bypass depth limits.
 const MaxYAMLNodes = 1000
 
+// RepoPersonasPath is the path within a repository where custom personas are stored.
+const RepoPersonasPath = ".review-bot/personas"
+
 // Persona defines a specialized review role with focused expertise.
 type Persona struct {
 	Name         string   `json:"name" yaml:"name"`
@@ -48,6 +53,20 @@ type Severity struct {
 	Nit   string `json:"nit" yaml:"nit"`
 }
 
+// RepoContentFetcher is an interface for fetching file content from a repository.
+// This allows LoadRepoPersonas to work with any client that can list and fetch files.
+type RepoContentFetcher interface {
+	ListContents(ctx context.Context, owner, repo, path string) ([]ContentEntry, error)
+	GetFileContent(ctx context.Context, owner, repo, filepath string) (string, error)
+}
+
+// ContentEntry represents a file or directory entry (mirrors gitea.ContentEntry).
+type ContentEntry struct {
+	Name string `json:"name"`
+	Path string `json:"path"`
+	Type string `json:"type"` // "file" or "dir"
+}
+
 // LoadPersona loads a persona from a JSON or YAML file path.
 // Format is detected by file extension: .yaml/.yml for YAML, .json or other for JSON.
 // Files larger than MaxPersonaFileSize are rejected.
@@ -130,6 +149,92 @@ func ListBuiltinPersonas() []string {
 	return names
 }
 
+// LoadRepoPersonas loads custom personas from a repository's .review-bot/personas/ directory.
+// Returns an empty map if the directory doesn't exist or is empty.
+// Repo personas take precedence over built-in personas with the same name.
+func LoadRepoPersonas(ctx context.Context, client RepoContentFetcher, owner, repo string) (map[string]*Persona, error) {
+	personas := make(map[string]*Persona)
+
+	entries, err := client.ListContents(ctx, owner, repo, RepoPersonasPath)
+	if err != nil {
+		// Directory doesn't exist — not an error, just no custom personas
+		return personas, nil
+	}
+
+	for _, entry := range entries {
+		if entry.Type != "file" {
+			continue
+		}
+		// Only load YAML files
+		ext := strings.ToLower(filepath.Ext(entry.Name))
+		if ext != ".yaml" && ext != ".yml" {
+			continue
+		}
+
+		content, err := client.GetFileContent(ctx, owner, repo, entry.Path)
+		if err != nil {
+			// Log but don't fail — one bad persona shouldn't break the whole review
+			continue
+		}
+
+		// Validate file size
+		if len(content) > MaxPersonaFileSize {
+			continue
+		}
+
+		persona, err := parsePersona([]byte(content), "repo:"+entry.Path)
+		if err != nil {
+			// Log but don't fail
+			continue
+		}
+
+		personas[persona.Name] = persona
+	}
+
+	return personas, nil
+}
+
+// LoadPersonaWithFallback loads a persona by name, checking the repo first, then built-ins.
+// This is the primary entry point for loading personas during a review.
+func LoadPersonaWithFallback(ctx context.Context, client RepoContentFetcher, owner, repo, name string) (*Persona, error) {
+	// Try repo personas first
+	repoPersonas, err := LoadRepoPersonas(ctx, client, owner, repo)
+	if err == nil {
+		if p, ok := repoPersonas[name]; ok {
+			return p, nil
+		}
+	}
+
+	// Fall back to built-in
+	return LoadBuiltinPersona(name)
+}
+
+// ListAllPersonas returns a merged list of available personas (repo + built-in).
+// Repo personas take precedence over built-ins with the same name.
+func ListAllPersonas(ctx context.Context, client RepoContentFetcher, owner, repo string) []string {
+	seen := make(map[string]bool)
+
+	// Built-ins first
+	for _, name := range ListBuiltinPersonas() {
+		seen[name] = true
+	}
+
+	// Repo personas override
+	repoPersonas, err := LoadRepoPersonas(ctx, client, owner, repo)
+	if err == nil {
+		for name := range repoPersonas {
+			seen[name] = true
+		}
+	}
+
+	names := make([]string, 0, len(seen))
+	for name := range seen {
+		names = append(names, name)
+	}
+	sort.Strings(names)
+	return names
+}
+
 // parsePersona parses persona data from JSON or YAML format.
 // Format is detected by the source file extension.
 func parsePersona(data []byte, source string) (*Persona, error) {
@@ -224,13 +329,6 @@ func checkYAMLDepth(node *yaml.Node, depth, maxDepth, maxNodes int, seen map[*ya
 	return nil
 }
 
-// ParsePersonaBytes parses persona data from bytes with a source label for errors.
-// This is useful for parsing personas fetched from external sources (e.g., Gitea API)
-// without requiring filesystem access. Format is detected by source extension.
-func ParsePersonaBytes(data []byte, source string) (*Persona, error) {
-	return parsePersona(data, source)
-}
-
 func validatePersona(p *Persona, source string) error {
 	if p.Name == "" {
 		return fmt.Errorf("persona %s: name is required", source)

review/persona_test.go

@@ -1,6 +1,7 @@
 package review
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -776,3 +777,242 @@ identity: test identity
 		t.Errorf("Name = %q, want %q", p.Name, "test")
 	}
 }
+
+// MockRepoFetcher is a mock implementation of RepoContentFetcher for testing.
+type MockRepoFetcher struct {
+	Contents map[string][]ContentEntry // path -> entries
+	Files    map[string]string         // path -> content
+}
+
+func (m *MockRepoFetcher) ListContents(ctx context.Context, owner, repo, path string) ([]ContentEntry, error) {
+	key := fmt.Sprintf("%s/%s/%s", owner, repo, path)
+	entries, ok := m.Contents[key]
+	if !ok {
+		return nil, fmt.Errorf("path not found: %s", path)
+	}
+	return entries, nil
+}
+
+func (m *MockRepoFetcher) GetFileContent(ctx context.Context, owner, repo, filepath string) (string, error) {
+	key := fmt.Sprintf("%s/%s/%s", owner, repo, filepath)
+	content, ok := m.Files[key]
+	if !ok {
+		return "", fmt.Errorf("file not found: %s", filepath)
+	}
+	return content, nil
+}
+
+func TestLoadRepoPersonas(t *testing.T) {
+	validPersona := `name: custom-security
+display_name: Custom Security
+identity: |
+  You are a custom security reviewer.
+focus:
+  - SQL injection
+  - XSS attacks
+ignore:
+  - Code style
+severity:
+  major: Critical vulnerabilities
+  minor: Potential issues
+  nit: Suggestions
+`
+
+	tests := []struct {
+		name      string
+		fetcher   *MockRepoFetcher
+		wantCount int
+		wantNames []string
+	}{
+		{
+			name: "no personas directory",
+			fetcher: &MockRepoFetcher{
+				Contents: map[string][]ContentEntry{},
+				Files:    map[string]string{},
+			},
+			wantCount: 0,
+		},
+		{
+			name: "empty personas directory",
+			fetcher: &MockRepoFetcher{
+				Contents: map[string][]ContentEntry{
+					"owner/repo/.review-bot/personas": {},
+				},
+				Files: map[string]string{},
+			},
+			wantCount: 0,
+		},
+		{
+			name: "one valid persona",
+			fetcher: &MockRepoFetcher{
+				Contents: map[string][]ContentEntry{
+					"owner/repo/.review-bot/personas": {
+						{Name: "custom-security.yaml", Path: ".review-bot/personas/custom-security.yaml", Type: "file"},
+					},
+				},
+				Files: map[string]string{
+					"owner/repo/.review-bot/personas/custom-security.yaml": validPersona,
+				},
+			},
+			wantCount: 1,
+			wantNames: []string{"custom-security"},
+		},
+		{
+			name: "skip non-yaml files",
+			fetcher: &MockRepoFetcher{
+				Contents: map[string][]ContentEntry{
+					"owner/repo/.review-bot/personas": {
+						{Name: "custom-security.yaml", Path: ".review-bot/personas/custom-security.yaml", Type: "file"},
+						{Name: "readme.md", Path: ".review-bot/personas/readme.md", Type: "file"},
+						{Name: "subdir", Path: ".review-bot/personas/subdir", Type: "dir"},
+					},
+				},
+				Files: map[string]string{
+					"owner/repo/.review-bot/personas/custom-security.yaml": validPersona,
+				},
+			},
+			wantCount: 1,
+			wantNames: []string{"custom-security"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			ctx := context.Background()
+			personas, err := LoadRepoPersonas(ctx, tt.fetcher, "owner", "repo")
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if len(personas) != tt.wantCount {
+				t.Errorf("got %d personas, want %d", len(personas), tt.wantCount)
+			}
+			for _, name := range tt.wantNames {
+				if _, ok := personas[name]; !ok {
+					t.Errorf("missing expected persona %q", name)
+				}
+			}
+		})
+	}
+}
+
+func TestLoadPersonaWithFallback(t *testing.T) {
+	customSecurity := `name: security
+display_name: Custom Security Override
+identity: |
+  Custom security reviewer for this repo.
+focus:
+  - Repo-specific security
+ignore:
+  - General stuff
+severity:
+  major: Critical
+  minor: Warning
+  nit: Info
+`
+
+	tests := []struct {
+		name            string
+		fetcher         *MockRepoFetcher
+		personaName     string
+		wantDisplayName string
+		wantErr         bool
+	}{
+		{
+			name: "repo persona overrides builtin",
+			fetcher: &MockRepoFetcher{
+				Contents: map[string][]ContentEntry{
+					"owner/repo/.review-bot/personas": {
+						{Name: "security.yaml", Path: ".review-bot/personas/security.yaml", Type: "file"},
+					},
+				},
+				Files: map[string]string{
+					"owner/repo/.review-bot/personas/security.yaml": customSecurity,
+				},
+			},
+			personaName:     "security",
+			wantDisplayName: "Custom Security Override",
+		},
+		{
+			name: "fallback to builtin when repo has no override",
+			fetcher: &MockRepoFetcher{
+				Contents: map[string][]ContentEntry{},
+				Files:    map[string]string{},
+			},
+			personaName:     "security",
+			wantDisplayName: "Security Specialist",
+		},
+		{
+			name: "unknown persona",
+			fetcher: &MockRepoFetcher{
+				Contents: map[string][]ContentEntry{},
+				Files:    map[string]string{},
+			},
+			personaName: "nonexistent",
+			wantErr:     true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			ctx := context.Background()
+			p, err := LoadPersonaWithFallback(ctx, tt.fetcher, "owner", "repo", tt.personaName)
+			if tt.wantErr {
+				if err == nil {
+					t.Error("expected error, got nil")
+				}
+				return
+			}
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if p.DisplayName != tt.wantDisplayName {
+				t.Errorf("DisplayName = %q, want %q", p.DisplayName, tt.wantDisplayName)
+			}
+		})
+	}
+}
+
+func TestListAllPersonas(t *testing.T) {
+	customPersona := `name: repo-specific
+display_name: Repo Specific
+identity: A repo-specific reviewer.
+focus: []
+ignore: []
+severity:
+  major: Major
+  minor: Minor
+  nit: Nit
+`
+
+	fetcher := &MockRepoFetcher{
+		Contents: map[string][]ContentEntry{
+			"owner/repo/.review-bot/personas": {
+				{Name: "repo-specific.yaml", Path: ".review-bot/personas/repo-specific.yaml", Type: "file"},
+			},
+		},
+		Files: map[string]string{
+			"owner/repo/.review-bot/personas/repo-specific.yaml": customPersona,
+		},
+	}
+
+	ctx := context.Background()
+	names := ListAllPersonas(ctx, fetcher, "owner", "repo")
+
+	// Should include both built-ins and repo-specific
+	builtins := ListBuiltinPersonas()
+	if len(names) <= len(builtins) {
+		t.Error("expected more personas than just built-ins")
+	}
+
+	// Check repo-specific is included
+	found := false
+	for _, name := range names {
+		if name == "repo-specific" {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Error("repo-specific persona not found in list")
+	}
+}

review/repo_persona.go

@@ -1,138 +0,0 @@
-package review
-
-import (
-	"context"
-	"log/slog"
-	"strings"
-)
-
-// RepoPersonaPath is the directory path where repo-specific personas are stored.
-const RepoPersonaPath = ".review-bot/personas"
-
-// GiteaClient defines the subset of gitea.Client methods needed for loading repo personas.
-// This interface allows for easier testing and decouples the review package from gitea.
-type GiteaClient interface {
-	ListContents(ctx context.Context, owner, repo, path string) ([]ContentEntry, error)
-	GetFileContent(ctx context.Context, owner, repo, filepath string) (string, error)
-}
-
-// ContentEntry represents a file or directory entry from the contents API.
-// This mirrors gitea.ContentEntry to avoid import cycles.
-type ContentEntry struct {
-	Name string `json:"name"`
-	Path string `json:"path"`
-	Type string `json:"type"` // "file" or "dir"
-}
-
-// LoadRepoPersonas fetches personas from a repository's .review-bot/personas/ directory.
-// Returns an empty map (not nil) if the directory doesn't exist or is empty.
-// Individual parse failures are logged and skipped; the remaining personas are still returned.
-// Auth errors and other non-404 errors are propagated.
-func LoadRepoPersonas(ctx context.Context, client GiteaClient, owner, repo string) (map[string]*Persona, error) {
-	result := make(map[string]*Persona)
-
-	entries, err := client.ListContents(ctx, owner, repo, RepoPersonaPath)
-	if err != nil {
-		// Check if this is a 404 (directory doesn't exist) - expected case
-		if isNotFoundError(err) {
-			slog.Debug("no repo personas directory found", "repo", owner+"/"+repo)
-			return result, nil
-		}
-		// Other errors (auth, server) should propagate
-		return nil, err
-	}
-
-	if len(entries) == 0 {
-		slog.Debug("repo personas directory is empty", "repo", owner+"/"+repo)
-		return result, nil
-	}
-
-	for _, entry := range entries {
-		if entry.Type != "file" {
-			continue
-		}
-		// Only process YAML files
-		if !isYAMLFile(entry.Name) {
-			continue
-		}
-
-		content, err := client.GetFileContent(ctx, owner, repo, entry.Path)
-		if err != nil {
-			slog.Warn("could not fetch repo persona file",
-				"file", entry.Path,
-				"repo", owner+"/"+repo,
-				"error", err)
-			continue
-		}
-
-		persona, err := ParsePersonaBytes([]byte(content), entry.Path)
-		if err != nil {
-			slog.Warn("could not parse repo persona file",
-				"file", entry.Path,
-				"repo", owner+"/"+repo,
-				"error", err)
-			continue
-		}
-
-		result[persona.Name] = persona
-		slog.Debug("loaded repo persona",
-			"name", persona.Name,
-			"file", entry.Path,
-			"repo", owner+"/"+repo)
-	}
-
-	return result, nil
-}
-
-// MergePersonas combines built-in personas with repo personas.
-// Repo personas take precedence on name collision.
-// Returns a new map; inputs are not modified.
-func MergePersonas(builtin, repo map[string]*Persona) map[string]*Persona {
-	result := make(map[string]*Persona, len(builtin)+len(repo))
-
-	// Copy built-in personas first
-	for name, p := range builtin {
-		result[name] = p
-	}
-
-	// Overlay repo personas (override on collision)
-	for name, p := range repo {
-		if _, exists := result[name]; exists {
-			slog.Debug("repo persona overrides built-in", "name", name)
-		}
-		result[name] = p
-	}
-
-	return result
-}
-
-// GetBuiltinPersonasMap returns all built-in personas as a map keyed by name.
-// Returns an empty map (not nil) if loading fails.
-func GetBuiltinPersonasMap() map[string]*Persona {
-	result := make(map[string]*Persona)
-	for _, name := range ListBuiltinPersonas() {
-		p, err := LoadBuiltinPersona(name)
-		if err != nil {
-			slog.Warn("could not load built-in persona", "name", name, "error", err)
-			continue
-		}
-		result[name] = p
-	}
-	return result
-}
-
-// isYAMLFile checks if a filename has a YAML extension.
-func isYAMLFile(name string) bool {
-	lower := strings.ToLower(name)
-	return strings.HasSuffix(lower, ".yaml") || strings.HasSuffix(lower, ".yml")
-}
-
-// isNotFoundError checks if an error represents a 404 response.
-// This is a string-based heuristic since we don't have access to gitea.APIError here.
-func isNotFoundError(err error) bool {
-	if err == nil {
-		return false
-	}
-	errStr := err.Error()
-	return strings.Contains(errStr, "HTTP 404") || strings.Contains(errStr, "not found")
-}

review/repo_persona_test.go

@@ -1,410 +0,0 @@
-package review
-
-import (
-	"context"
-	"errors"
-	"strings"
-	"testing"
-)
-
-func TestParsePersonaBytes(t *testing.T) {
-	tests := []struct {
-		name       string
-		data       string
-		source     string
-		wantName   string
-		wantErr    string
-	}{
-		{
-			name: "valid yaml",
-			data: `name: test
-identity: test identity
-focus:
-  - testing
-`,
-			source:   "test.yaml",
-			wantName: "test",
-		},
-		{
-			name:    "missing name",
-			data:    "identity: test\n",
-			source:  "test.yaml",
-			wantErr: "name is required",
-		},
-		{
-			name:    "invalid yaml",
-			data:    "not: valid:\n  yaml: [broken",
-			source:  "test.yaml",
-			wantErr: "parse",
-		},
-		{
-			name: "json format by extension",
-			data: `{"name": "jsontest", "identity": "json identity"}`,
-			source:   "test.json",
-			wantName: "jsontest",
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			p, err := ParsePersonaBytes([]byte(tt.data), tt.source)
-			if tt.wantErr != "" {
-				if err == nil {
-					t.Fatalf("expected error containing %q, got nil", tt.wantErr)
-				}
-				if !strings.Contains(err.Error(), tt.wantErr) {
-					t.Errorf("error = %q, want containing %q", err.Error(), tt.wantErr)
-				}
-				return
-			}
-			if err != nil {
-				t.Fatalf("unexpected error: %v", err)
-			}
-			if p.Name != tt.wantName {
-				t.Errorf("Name = %q, want %q", p.Name, tt.wantName)
-			}
-		})
-	}
-}
-
-// mockGiteaClient implements GiteaClient for testing.
-type mockGiteaClient struct {
-	contents map[string][]ContentEntry // path -> entries
-	files    map[string]string         // path -> content
-	listErr  error
-	fileErr  map[string]error // path -> error
-}
-
-func (m *mockGiteaClient) ListContents(ctx context.Context, owner, repo, path string) ([]ContentEntry, error) {
-	if m.listErr != nil {
-		return nil, m.listErr
-	}
-	entries, ok := m.contents[path]
-	if !ok {
-		return nil, errors.New("list contents .review-bot/personas: HTTP 404: not found")
-	}
-	return entries, nil
-}
-
-func (m *mockGiteaClient) GetFileContent(ctx context.Context, owner, repo, filepath string) (string, error) {
-	if m.fileErr != nil {
-		if err, ok := m.fileErr[filepath]; ok {
-			return "", err
-		}
-	}
-	content, ok := m.files[filepath]
-	if !ok {
-		return "", errors.New("HTTP 404: file not found")
-	}
-	return content, nil
-}
-
-func TestLoadRepoPersonas(t *testing.T) {
-	ctx := context.Background()
-
-	t.Run("directory not found returns empty map", func(t *testing.T) {
-		client := &mockGiteaClient{} // No contents configured -> 404
-		personas, err := LoadRepoPersonas(ctx, client, "owner", "repo")
-		if err != nil {
-			t.Fatalf("unexpected error: %v", err)
-		}
-		if personas == nil {
-			t.Error("expected empty map, got nil")
-		}
-		if len(personas) != 0 {
-			t.Errorf("expected 0 personas, got %d", len(personas))
-		}
-	})
-
-	t.Run("empty directory returns empty map", func(t *testing.T) {
-		client := &mockGiteaClient{
-			contents: map[string][]ContentEntry{
-				RepoPersonaPath: {},
-			},
-		}
-		personas, err := LoadRepoPersonas(ctx, client, "owner", "repo")
-		if err != nil {
-			t.Fatalf("unexpected error: %v", err)
-		}
-		if len(personas) != 0 {
-			t.Errorf("expected 0 personas, got %d", len(personas))
-		}
-	})
-
-	t.Run("loads valid personas", func(t *testing.T) {
-		client := &mockGiteaClient{
-			contents: map[string][]ContentEntry{
-				RepoPersonaPath: {
-					{Name: "trading.yaml", Path: ".review-bot/personas/trading.yaml", Type: "file"},
-					{Name: "crypto.yaml", Path: ".review-bot/personas/crypto.yaml", Type: "file"},
-				},
-			},
-			files: map[string]string{
-				".review-bot/personas/trading.yaml": `name: trading
-display_name: Trading Expert
-identity: You are a trading expert.
-focus:
-  - order handling
-  - risk management
-`,
-				".review-bot/personas/crypto.yaml": `name: crypto
-display_name: Crypto Expert
-identity: You are a cryptography expert.
-focus:
-  - key management
-  - encryption
-`,
-			},
-		}
-		personas, err := LoadRepoPersonas(ctx, client, "owner", "repo")
-		if err != nil {
-			t.Fatalf("unexpected error: %v", err)
-		}
-		if len(personas) != 2 {
-			t.Fatalf("expected 2 personas, got %d", len(personas))
-		}
-		if personas["trading"] == nil {
-			t.Error("expected trading persona")
-		}
-		if personas["crypto"] == nil {
-			t.Error("expected crypto persona")
-		}
-		if personas["trading"].DisplayName != "Trading Expert" {
-			t.Errorf("trading display name = %q, want %q", personas["trading"].DisplayName, "Trading Expert")
-		}
-	})
-
-	t.Run("skips invalid persona files", func(t *testing.T) {
-		client := &mockGiteaClient{
-			contents: map[string][]ContentEntry{
-				RepoPersonaPath: {
-					{Name: "valid.yaml", Path: ".review-bot/personas/valid.yaml", Type: "file"},
-					{Name: "invalid.yaml", Path: ".review-bot/personas/invalid.yaml", Type: "file"},
-				},
-			},
-			files: map[string]string{
-				".review-bot/personas/valid.yaml": `name: valid
-identity: Valid persona
-`,
-				".review-bot/personas/invalid.yaml": "not valid yaml: [broken",
-			},
-		}
-		personas, err := LoadRepoPersonas(ctx, client, "owner", "repo")
-		if err != nil {
-			t.Fatalf("unexpected error: %v", err)
-		}
-		// Should have the valid one, skip the invalid
-		if len(personas) != 1 {
-			t.Fatalf("expected 1 persona (skipped invalid), got %d", len(personas))
-		}
-		if personas["valid"] == nil {
-			t.Error("expected valid persona")
-		}
-	})
-
-	t.Run("skips non-yaml files", func(t *testing.T) {
-		client := &mockGiteaClient{
-			contents: map[string][]ContentEntry{
-				RepoPersonaPath: {
-					{Name: "persona.yaml", Path: ".review-bot/personas/persona.yaml", Type: "file"},
-					{Name: "README.md", Path: ".review-bot/personas/README.md", Type: "file"},
-					{Name: "notes.txt", Path: ".review-bot/personas/notes.txt", Type: "file"},
-				},
-			},
-			files: map[string]string{
-				".review-bot/personas/persona.yaml": `name: test
-identity: Test persona
-`,
-				".review-bot/personas/README.md": "# Personas\n\nPut your personas here.",
-			},
-		}
-		personas, err := LoadRepoPersonas(ctx, client, "owner", "repo")
-		if err != nil {
-			t.Fatalf("unexpected error: %v", err)
-		}
-		if len(personas) != 1 {
-			t.Fatalf("expected 1 persona (yaml only), got %d", len(personas))
-		}
-	})
-
-	t.Run("skips subdirectories", func(t *testing.T) {
-		client := &mockGiteaClient{
-			contents: map[string][]ContentEntry{
-				RepoPersonaPath: {
-					{Name: "persona.yaml", Path: ".review-bot/personas/persona.yaml", Type: "file"},
-					{Name: "subdir", Path: ".review-bot/personas/subdir", Type: "dir"},
-				},
-			},
-			files: map[string]string{
-				".review-bot/personas/persona.yaml": `name: test
-identity: Test persona
-`,
-			},
-		}
-		personas, err := LoadRepoPersonas(ctx, client, "owner", "repo")
-		if err != nil {
-			t.Fatalf("unexpected error: %v", err)
-		}
-		if len(personas) != 1 {
-			t.Fatalf("expected 1 persona (files only), got %d", len(personas))
-		}
-	})
-
-	t.Run("propagates auth errors", func(t *testing.T) {
-		client := &mockGiteaClient{
-			listErr: errors.New("HTTP 401: unauthorized"),
-		}
-		_, err := LoadRepoPersonas(ctx, client, "owner", "repo")
-		if err == nil {
-			t.Fatal("expected error for auth failure")
-		}
-		if !strings.Contains(err.Error(), "401") {
-			t.Errorf("error = %q, want containing '401'", err.Error())
-		}
-	})
-
-	t.Run("skips files that fail to fetch", func(t *testing.T) {
-		client := &mockGiteaClient{
-			contents: map[string][]ContentEntry{
-				RepoPersonaPath: {
-					{Name: "good.yaml", Path: ".review-bot/personas/good.yaml", Type: "file"},
-					{Name: "bad.yaml", Path: ".review-bot/personas/bad.yaml", Type: "file"},
-				},
-			},
-			files: map[string]string{
-				".review-bot/personas/good.yaml": `name: good
-identity: Good persona
-`,
-			},
-			fileErr: map[string]error{
-				".review-bot/personas/bad.yaml": errors.New("HTTP 500: internal server error"),
-			},
-		}
-		personas, err := LoadRepoPersonas(ctx, client, "owner", "repo")
-		if err != nil {
-			t.Fatalf("unexpected error: %v", err)
-		}
-		if len(personas) != 1 {
-			t.Fatalf("expected 1 persona (skipped failed fetch), got %d", len(personas))
-		}
-	})
-}
-
-func TestMergePersonas(t *testing.T) {
-	builtin := map[string]*Persona{
-		"security": {Name: "security", Identity: "Built-in security"},
-		"docs":     {Name: "docs", Identity: "Built-in docs"},
-	}
-	repo := map[string]*Persona{
-		"security": {Name: "security", Identity: "Repo security override"},
-		"trading":  {Name: "trading", Identity: "Repo trading"},
-	}
-
-	merged := MergePersonas(builtin, repo)
-
-	t.Run("repo overrides builtin on collision", func(t *testing.T) {
-		if merged["security"].Identity != "Repo security override" {
-			t.Errorf("security identity = %q, want repo override", merged["security"].Identity)
-		}
-	})
-
-	t.Run("builtin preserved when no collision", func(t *testing.T) {
-		if merged["docs"].Identity != "Built-in docs" {
-			t.Errorf("docs identity = %q, want built-in", merged["docs"].Identity)
-		}
-	})
-
-	t.Run("repo-only persona added", func(t *testing.T) {
-		if merged["trading"] == nil {
-			t.Error("expected trading persona from repo")
-		}
-		if merged["trading"].Identity != "Repo trading" {
-			t.Errorf("trading identity = %q, want repo", merged["trading"].Identity)
-		}
-	})
-
-	t.Run("original maps not modified", func(t *testing.T) {
-		if builtin["trading"] != nil {
-			t.Error("builtin map was modified")
-		}
-		if len(repo) != 2 {
-			t.Error("repo map was modified")
-		}
-	})
-}
-
-func TestGetBuiltinPersonasMap(t *testing.T) {
-	personas := GetBuiltinPersonasMap()
-
-	if len(personas) == 0 {
-		t.Fatal("expected at least one built-in persona")
-	}
-
-	// Verify expected personas exist
-	expected := []string{"security", "architect", "docs"}
-	for _, name := range expected {
-		if personas[name] == nil {
-			t.Errorf("expected built-in persona %q", name)
-		}
-	}
-
-	// Verify personas are valid
-	for name, p := range personas {
-		if p.Name != name {
-			t.Errorf("persona %q has mismatched name %q", name, p.Name)
-		}
-		if p.Identity == "" {
-			t.Errorf("persona %q has empty identity", name)
-		}
-	}
-}
-
-func TestIsYAMLFile(t *testing.T) {
-	tests := []struct {
-		name string
-		want bool
-	}{
-		{"test.yaml", true},
-		{"test.yml", true},
-		{"test.YAML", true},
-		{"test.YML", true},
-		{"test.json", false},
-		{"test.md", false},
-		{"test.txt", false},
-		{"yaml", false},
-		{"yaml.md", false},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if got := isYAMLFile(tt.name); got != tt.want {
-				t.Errorf("isYAMLFile(%q) = %v, want %v", tt.name, got, tt.want)
-			}
-		})
-	}
-}
-
-func TestIsNotFoundError(t *testing.T) {
-	tests := []struct {
-		err  error
-		want bool
-	}{
-		{nil, false},
-		{errors.New("HTTP 404: not found"), true},
-		{errors.New("something not found"), true},
-		{errors.New("HTTP 401: unauthorized"), false},
-		{errors.New("connection refused"), false},
-	}
-
-	for _, tt := range tests {
-		name := "nil"
-		if tt.err != nil {
-			name = tt.err.Error()
-		}
-		t.Run(name, func(t *testing.T) {
-			if got := isNotFoundError(tt.err); got != tt.want {
-				t.Errorf("isNotFoundError(%v) = %v, want %v", tt.err, got, tt.want)
-			}
-		})
-	}
-}