refactor: restructure codebase to internal/ directory with modular architecture

- Move all source files to internal/{app,backend,config,executor,logger,parser,utils}
- Integrate third-party libraries: zerolog, goccy/go-json, gopsutil, cobra/viper
- Add comprehensive unit tests for utils package (94.3% coverage)
- Add performance benchmarks for string operations
- Fix error display: cleanup warnings no longer pollute Recent Errors
- Add GitHub Actions CI workflow
- Add Makefile for build automation
- Add README documentation

Generated with SWE-Agent.ai

Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>

codeagent-wrapper/internal/executor/prompt_file_test.go

@@ -0,0 +1,186 @@
+package executor
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+func TestWrapTaskWithAgentPrompt(t *testing.T) {
+	got := WrapTaskWithAgentPrompt("P", "do")
+	want := "<agent-prompt>\nP\n</agent-prompt>\n\ndo"
+	if got != want {
+		t.Fatalf("wrapTaskWithAgentPrompt mismatch:\n got=%q\nwant=%q", got, want)
+	}
+}
+
+func TestReadAgentPromptFile_EmptyPath(t *testing.T) {
+	for _, allowOutside := range []bool{false, true} {
+		got, err := ReadAgentPromptFile("   ", allowOutside)
+		if err != nil {
+			t.Fatalf("unexpected error (allowOutside=%v): %v", allowOutside, err)
+		}
+		if got != "" {
+			t.Fatalf("expected empty result (allowOutside=%v), got %q", allowOutside, got)
+		}
+	}
+}
+
+func TestReadAgentPromptFile_ExplicitAbsolutePath(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "prompt.md")
+	if err := os.WriteFile(path, []byte("LINE1\n"), 0o644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	got, err := ReadAgentPromptFile(path, true)
+	if err != nil {
+		t.Fatalf("readAgentPromptFile error: %v", err)
+	}
+	if got != "LINE1" {
+		t.Fatalf("got %q, want %q", got, "LINE1")
+	}
+}
+
+func TestReadAgentPromptFile_ExplicitTildeExpansion(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("USERPROFILE", home)
+
+	path := filepath.Join(home, "prompt.md")
+	if err := os.WriteFile(path, []byte("P\n"), 0o644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	got, err := ReadAgentPromptFile("~/prompt.md", true)
+	if err != nil {
+		t.Fatalf("readAgentPromptFile error: %v", err)
+	}
+	if got != "P" {
+		t.Fatalf("got %q, want %q", got, "P")
+	}
+}
+
+func TestReadAgentPromptFile_RestrictedAllowsClaudeDir(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("USERPROFILE", home)
+
+	claudeDir := filepath.Join(home, ".claude")
+	if err := os.MkdirAll(claudeDir, 0o755); err != nil {
+		t.Fatalf("MkdirAll: %v", err)
+	}
+	path := filepath.Join(claudeDir, "prompt.md")
+	if err := os.WriteFile(path, []byte("OK\n"), 0o644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	got, err := ReadAgentPromptFile("~/.claude/prompt.md", false)
+	if err != nil {
+		t.Fatalf("readAgentPromptFile error: %v", err)
+	}
+	if got != "OK" {
+		t.Fatalf("got %q, want %q", got, "OK")
+	}
+}
+
+func TestReadAgentPromptFile_RestrictedAllowsCodeagentAgentsDir(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("USERPROFILE", home)
+
+	agentDir := filepath.Join(home, ".codeagent", "agents")
+	if err := os.MkdirAll(agentDir, 0o755); err != nil {
+		t.Fatalf("MkdirAll: %v", err)
+	}
+	path := filepath.Join(agentDir, "sarsh.md")
+	if err := os.WriteFile(path, []byte("OK\n"), 0o644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	got, err := ReadAgentPromptFile("~/.codeagent/agents/sarsh.md", false)
+	if err != nil {
+		t.Fatalf("readAgentPromptFile error: %v", err)
+	}
+	if got != "OK" {
+		t.Fatalf("got %q, want %q", got, "OK")
+	}
+}
+
+func TestReadAgentPromptFile_RestrictedRejectsOutsideClaudeDir(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("USERPROFILE", home)
+
+	path := filepath.Join(home, "prompt.md")
+	if err := os.WriteFile(path, []byte("NO\n"), 0o644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	if _, err := ReadAgentPromptFile("~/prompt.md", false); err == nil {
+		t.Fatalf("expected error for prompt file outside ~/.claude, got nil")
+	}
+}
+
+func TestReadAgentPromptFile_RestrictedRejectsTraversal(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("USERPROFILE", home)
+
+	path := filepath.Join(home, "secret.md")
+	if err := os.WriteFile(path, []byte("SECRET\n"), 0o644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	if _, err := ReadAgentPromptFile("~/.claude/../secret.md", false); err == nil {
+		t.Fatalf("expected traversal to be rejected, got nil")
+	}
+}
+
+func TestReadAgentPromptFile_NotFound(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("USERPROFILE", home)
+
+	claudeDir := filepath.Join(home, ".claude")
+	if err := os.MkdirAll(claudeDir, 0o755); err != nil {
+		t.Fatalf("MkdirAll: %v", err)
+	}
+
+	_, err := ReadAgentPromptFile("~/.claude/missing.md", false)
+	if err == nil || !os.IsNotExist(err) {
+		t.Fatalf("expected not-exist error, got %v", err)
+	}
+}
+
+func TestReadAgentPromptFile_PermissionDenied(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("chmod-based permission test is not reliable on Windows")
+	}
+
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("USERPROFILE", home)
+
+	claudeDir := filepath.Join(home, ".claude")
+	if err := os.MkdirAll(claudeDir, 0o755); err != nil {
+		t.Fatalf("MkdirAll: %v", err)
+	}
+	path := filepath.Join(claudeDir, "private.md")
+	if err := os.WriteFile(path, []byte("PRIVATE\n"), 0o600); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+	if err := os.Chmod(path, 0o000); err != nil {
+		t.Fatalf("Chmod: %v", err)
+	}
+
+	_, err := ReadAgentPromptFile("~/.claude/private.md", false)
+	if err == nil {
+		t.Fatalf("expected permission error, got nil")
+	}
+	if !os.IsPermission(err) && !strings.Contains(strings.ToLower(err.Error()), "permission") {
+		t.Fatalf("expected permission denied, got: %v", err)
+	}
+}