feat: Implement GitHub issue validation management and UI enhancements

- Introduced CRUD operations for GitHub issue validation results, including storage and retrieval.
- Added new endpoints for checking validation status, stopping validations, and deleting stored validations.
- Enhanced the GitHub routes to support validation management features.
- Updated the UI to display validation results and manage validation states for GitHub issues.
- Integrated event handling for validation progress and completion notifications.

apps/server/src/lib/validation-storage.ts

@@ -0,0 +1,147 @@
+/**
+ * Validation Storage - CRUD operations for GitHub issue validation results
+ *
+ * Stores validation results in .automaker/validations/{issueNumber}/validation.json
+ * Results include the validation verdict, metadata, and timestamp for cache invalidation.
+ */
+
+import * as secureFs from './secure-fs.js';
+import { getValidationsDir, getValidationDir, getValidationPath } from '@automaker/platform';
+import type { StoredValidation } from '@automaker/types';
+
+// Re-export StoredValidation for convenience
+export type { StoredValidation };
+
+/** Number of hours before a validation is considered stale */
+const VALIDATION_CACHE_TTL_HOURS = 24;
+
+/**
+ * Write validation result to storage
+ *
+ * Creates the validation directory if needed and stores the result as JSON.
+ *
+ * @param projectPath - Absolute path to project directory
+ * @param issueNumber - GitHub issue number
+ * @param data - Validation data to store
+ */
+export async function writeValidation(
+  projectPath: string,
+  issueNumber: number,
+  data: StoredValidation
+): Promise<void> {
+  const validationDir = getValidationDir(projectPath, issueNumber);
+  const validationPath = getValidationPath(projectPath, issueNumber);
+
+  // Ensure directory exists
+  await secureFs.mkdir(validationDir, { recursive: true });
+
+  // Write validation result
+  await secureFs.writeFile(validationPath, JSON.stringify(data, null, 2), 'utf-8');
+}
+
+/**
+ * Read validation result from storage
+ *
+ * @param projectPath - Absolute path to project directory
+ * @param issueNumber - GitHub issue number
+ * @returns Stored validation or null if not found
+ */
+export async function readValidation(
+  projectPath: string,
+  issueNumber: number
+): Promise<StoredValidation | null> {
+  try {
+    const validationPath = getValidationPath(projectPath, issueNumber);
+    const content = (await secureFs.readFile(validationPath, 'utf-8')) as string;
+    return JSON.parse(content) as StoredValidation;
+  } catch {
+    // File doesn't exist or can't be read
+    return null;
+  }
+}
+
+/**
+ * Get all stored validations for a project
+ *
+ * @param projectPath - Absolute path to project directory
+ * @returns Array of stored validations
+ */
+export async function getAllValidations(projectPath: string): Promise<StoredValidation[]> {
+  const validations: StoredValidation[] = [];
+  const validationsDir = getValidationsDir(projectPath);
+
+  try {
+    const dirs = await secureFs.readdir(validationsDir, { withFileTypes: true });
+
+    for (const dir of dirs) {
+      if (dir.isDirectory()) {
+        const issueNumber = parseInt(dir.name, 10);
+        if (!isNaN(issueNumber)) {
+          const validation = await readValidation(projectPath, issueNumber);
+          if (validation) {
+            validations.push(validation);
+          }
+        }
+      }
+    }
+  } catch {
+    // Directory doesn't exist
+  }
+
+  // Sort by issue number
+  validations.sort((a, b) => a.issueNumber - b.issueNumber);
+
+  return validations;
+}
+
+/**
+ * Delete a validation from storage
+ *
+ * @param projectPath - Absolute path to project directory
+ * @param issueNumber - GitHub issue number
+ * @returns true if validation was deleted, false if not found
+ */
+export async function deleteValidation(projectPath: string, issueNumber: number): Promise<boolean> {
+  try {
+    const validationDir = getValidationDir(projectPath, issueNumber);
+    await secureFs.rm(validationDir, { recursive: true, force: true });
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Check if a validation is stale (older than TTL)
+ *
+ * @param validation - Stored validation to check
+ * @returns true if validation is older than 24 hours
+ */
+export function isValidationStale(validation: StoredValidation): boolean {
+  const validatedAt = new Date(validation.validatedAt);
+  const now = new Date();
+  const hoursDiff = (now.getTime() - validatedAt.getTime()) / (1000 * 60 * 60);
+  return hoursDiff > VALIDATION_CACHE_TTL_HOURS;
+}
+
+/**
+ * Get validation with freshness info
+ *
+ * @param projectPath - Absolute path to project directory
+ * @param issueNumber - GitHub issue number
+ * @returns Object with validation and isStale flag, or null if not found
+ */
+export async function getValidationWithFreshness(
+  projectPath: string,
+  issueNumber: number
+): Promise<{ validation: StoredValidation; isStale: boolean } | null> {
+  const validation = await readValidation(projectPath, issueNumber);
+  if (!validation) {
+    return null;
+  }
+
+  return {
+    validation,
+    isStale: isValidationStale(validation),
+  };
+}