test: Add comprehensive tests for platform and utils packages

Added extensive test coverage for previously untested files:

Platform package (94.69% coverage, +47 tests):
- paths.test.ts: 22 tests for path construction and directory creation
- security.test.ts: 25 tests for path validation and security

Utils package (94.3% coverage, +109 tests):
- logger.test.ts: 23 tests for logging with levels
- fs-utils.test.ts: 20 tests for safe file operations
- conversation-utils.test.ts: 24 tests for message formatting
- image-handler.test.ts: 25 tests for image processing
- prompt-builder.test.ts: 17 tests for prompt construction

Coverage improvements:
- Platform: 63.71% → 94.69% stmts, 40% → 97.14% funcs
- Utils: 19.51% → 94.3% stmts, 18.51% → 100% funcs

Updated thresholds to enforce high quality:
- Platform: 90% lines/stmts, 95% funcs, 75% branches
- Utils: 90% lines/stmts, 95% funcs, 85% branches

Total new tests: 156 (platform: 47, utils: 109)
All tests passing with new coverage thresholds.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

libs/platform/tests/paths.test.ts

@@ -0,0 +1,227 @@
+import { describe, it, expect, beforeEach, afterEach } from "vitest";
+import fs from "fs/promises";
+import path from "path";
+import os from "os";
+import {
+  getAutomakerDir,
+  getFeaturesDir,
+  getFeatureDir,
+  getFeatureImagesDir,
+  getBoardDir,
+  getImagesDir,
+  getContextDir,
+  getWorktreesDir,
+  getAppSpecPath,
+  getBranchTrackingPath,
+  ensureAutomakerDir,
+  getGlobalSettingsPath,
+  getCredentialsPath,
+  getProjectSettingsPath,
+  ensureDataDir,
+} from "../src/paths";
+
+describe("paths.ts", () => {
+  let tempDir: string;
+  let projectPath: string;
+  let dataDir: string;
+
+  beforeEach(async () => {
+    // Create a temporary directory for testing
+    tempDir = await fs.mkdtemp(path.join(os.tmpdir(), "platform-paths-test-"));
+    projectPath = path.join(tempDir, "test-project");
+    dataDir = path.join(tempDir, "user-data");
+    await fs.mkdir(projectPath, { recursive: true });
+  });
+
+  afterEach(async () => {
+    // Clean up temporary directory
+    try {
+      await fs.rm(tempDir, { recursive: true, force: true });
+    } catch (error) {
+      // Ignore cleanup errors
+    }
+  });
+
+  describe("Project-level path construction", () => {
+    it("should return automaker directory path", () => {
+      const result = getAutomakerDir(projectPath);
+      expect(result).toBe(path.join(projectPath, ".automaker"));
+    });
+
+    it("should return features directory path", () => {
+      const result = getFeaturesDir(projectPath);
+      expect(result).toBe(path.join(projectPath, ".automaker", "features"));
+    });
+
+    it("should return feature directory path", () => {
+      const featureId = "auth-feature";
+      const result = getFeatureDir(projectPath, featureId);
+      expect(result).toBe(
+        path.join(projectPath, ".automaker", "features", featureId)
+      );
+    });
+
+    it("should return feature images directory path", () => {
+      const featureId = "auth-feature";
+      const result = getFeatureImagesDir(projectPath, featureId);
+      expect(result).toBe(
+        path.join(projectPath, ".automaker", "features", featureId, "images")
+      );
+    });
+
+    it("should return board directory path", () => {
+      const result = getBoardDir(projectPath);
+      expect(result).toBe(path.join(projectPath, ".automaker", "board"));
+    });
+
+    it("should return images directory path", () => {
+      const result = getImagesDir(projectPath);
+      expect(result).toBe(path.join(projectPath, ".automaker", "images"));
+    });
+
+    it("should return context directory path", () => {
+      const result = getContextDir(projectPath);
+      expect(result).toBe(path.join(projectPath, ".automaker", "context"));
+    });
+
+    it("should return worktrees directory path", () => {
+      const result = getWorktreesDir(projectPath);
+      expect(result).toBe(path.join(projectPath, ".automaker", "worktrees"));
+    });
+
+    it("should return app spec file path", () => {
+      const result = getAppSpecPath(projectPath);
+      expect(result).toBe(
+        path.join(projectPath, ".automaker", "app_spec.txt")
+      );
+    });
+
+    it("should return branch tracking file path", () => {
+      const result = getBranchTrackingPath(projectPath);
+      expect(result).toBe(
+        path.join(projectPath, ".automaker", "active-branches.json")
+      );
+    });
+
+    it("should return project settings file path", () => {
+      const result = getProjectSettingsPath(projectPath);
+      expect(result).toBe(
+        path.join(projectPath, ".automaker", "settings.json")
+      );
+    });
+  });
+
+  describe("Global settings path construction", () => {
+    it("should return global settings path", () => {
+      const result = getGlobalSettingsPath(dataDir);
+      expect(result).toBe(path.join(dataDir, "settings.json"));
+    });
+
+    it("should return credentials path", () => {
+      const result = getCredentialsPath(dataDir);
+      expect(result).toBe(path.join(dataDir, "credentials.json"));
+    });
+  });
+
+  describe("Directory creation", () => {
+    it("should create automaker directory", async () => {
+      const automakerDir = await ensureAutomakerDir(projectPath);
+
+      expect(automakerDir).toBe(path.join(projectPath, ".automaker"));
+
+      const stats = await fs.stat(automakerDir);
+      expect(stats.isDirectory()).toBe(true);
+    });
+
+    it("should be idempotent when creating automaker directory", async () => {
+      // Create directory first time
+      const firstResult = await ensureAutomakerDir(projectPath);
+
+      // Create directory second time
+      const secondResult = await ensureAutomakerDir(projectPath);
+
+      expect(firstResult).toBe(secondResult);
+
+      const stats = await fs.stat(firstResult);
+      expect(stats.isDirectory()).toBe(true);
+    });
+
+    it("should create data directory", async () => {
+      const result = await ensureDataDir(dataDir);
+
+      expect(result).toBe(dataDir);
+
+      const stats = await fs.stat(dataDir);
+      expect(stats.isDirectory()).toBe(true);
+    });
+
+    it("should be idempotent when creating data directory", async () => {
+      // Create directory first time
+      const firstResult = await ensureDataDir(dataDir);
+
+      // Create directory second time
+      const secondResult = await ensureDataDir(dataDir);
+
+      expect(firstResult).toBe(secondResult);
+
+      const stats = await fs.stat(firstResult);
+      expect(stats.isDirectory()).toBe(true);
+    });
+
+    it("should create nested directories recursively", async () => {
+      const deepProjectPath = path.join(
+        tempDir,
+        "nested",
+        "deep",
+        "project"
+      );
+      await fs.mkdir(deepProjectPath, { recursive: true });
+
+      const automakerDir = await ensureAutomakerDir(deepProjectPath);
+
+      const stats = await fs.stat(automakerDir);
+      expect(stats.isDirectory()).toBe(true);
+    });
+  });
+
+  describe("Path handling with special characters", () => {
+    it("should handle feature IDs with special characters", () => {
+      const featureId = "feature-with-dashes_and_underscores";
+      const result = getFeatureDir(projectPath, featureId);
+      expect(result).toContain(featureId);
+    });
+
+    it("should handle paths with spaces", () => {
+      const pathWithSpaces = path.join(tempDir, "path with spaces");
+      const result = getAutomakerDir(pathWithSpaces);
+      expect(result).toBe(path.join(pathWithSpaces, ".automaker"));
+    });
+  });
+
+  describe("Path relationships", () => {
+    it("should have feature dir as child of features dir", () => {
+      const featuresDir = getFeaturesDir(projectPath);
+      const featureDir = getFeatureDir(projectPath, "test-feature");
+
+      expect(featureDir.startsWith(featuresDir)).toBe(true);
+    });
+
+    it("should have all project paths under automaker dir", () => {
+      const automakerDir = getAutomakerDir(projectPath);
+      const paths = [
+        getFeaturesDir(projectPath),
+        getBoardDir(projectPath),
+        getImagesDir(projectPath),
+        getContextDir(projectPath),
+        getWorktreesDir(projectPath),
+        getAppSpecPath(projectPath),
+        getBranchTrackingPath(projectPath),
+        getProjectSettingsPath(projectPath),
+      ];
+
+      paths.forEach((p) => {
+        expect(p.startsWith(automakerDir)).toBe(true);
+      });
+    });
+  });
+});