fix(config): migrate all hardcoded paths to getCcsDir() and improve validation

- Replace os.homedir() + '.ccs' with getCcsDir() across 14 instances in 13 files:
  version-command, model-config, openrouter-catalog, config-checks, disk-cache,
  aggregator, auth-middleware, shell-completion, shared-manager, recovery-manager,
  auto-repair, delegation-validator, claude-dir-installer, cliproxy executor
- Add isDirectory() validation for --config-dir argument in ccs.ts
- Make detectCloudSyncPath() case-insensitive for cloud provider matching
- Fix help-command.ts to use dynamic dirDisplay for all path references
- Add 5 new tests: setGlobalConfigDir precedence, relative path resolution,
  reset behavior, getCcsDirSource with --config-dir, case-insensitive detection
- Clean up unused os imports after migration

src/utils/claude-dir-installer.ts

@@ -197,12 +197,7 @@ export class ClaudeDirInstaller {
   cleanupDeprecated(silent = false): CleanupResult {
     const deprecatedFile = path.join(this.ccsClaudeDir, 'agents', 'ccs-delegator.md');
     const userSymlinkFile = path.join(this.homeDir, '.claude', 'agents', 'ccs-delegator.md');
-    const migrationMarker = path.join(
-      this.homeDir,
-      '.ccs',
-      '.migrations',
-      'v435-delegator-cleanup'
-    );
+    const migrationMarker = path.join(getCcsDir(), '.migrations', 'v435-delegator-cleanup');
 
     const cleanedFiles: string[] = [];
 

src/utils/config-manager.ts

@@ -72,10 +72,10 @@ const CLOUD_SYNC_PATTERNS = [
  * @returns Detected service name or null
  */
 export function detectCloudSyncPath(dir: string): string | null {
-  const normalized = dir.replace(/\\/g, '/');
+  const normalized = dir.replace(/\\/g, '/').toLowerCase();
   for (const pattern of CLOUD_SYNC_PATTERNS) {
-    if (normalized.includes(pattern)) {
-      return pattern;
+    if (normalized.includes(pattern.toLowerCase())) {
+      return pattern; // Return original casing for display
     }
   }
   return null;

src/utils/delegation-validator.ts

@@ -2,9 +2,9 @@
 
 import * as fs from 'fs';
 import * as path from 'path';
-import * as os from 'os';
 import { Settings } from '../types';
 import { ValidationResult } from '../types/utils';
+import { getCcsDir } from './config-manager';
 
 /**
  * Extended validation result for delegation profiles
@@ -28,8 +28,7 @@ export class DelegationValidator {
    * @returns Validation result { valid: boolean, error?: string, settingsPath?: string }
    */
   static validate(profileName: string): DelegationValidationResult {
-    const homeDir = os.homedir();
-    const settingsPath = path.join(homeDir, '.ccs', `${profileName}.settings.json`);
+    const settingsPath = path.join(getCcsDir(), `${profileName}.settings.json`);
 
     // Check if profile directory exists
     if (!fs.existsSync(settingsPath)) {
@@ -144,8 +143,7 @@ export class DelegationValidator {
    * @returns List of profile names ready for delegation
    */
   static getReadyProfiles(): string[] {
-    const homeDir = os.homedir();
-    const ccsDir = path.join(homeDir, '.ccs');
+    const ccsDir = getCcsDir();
     const configPath = path.join(ccsDir, 'config.yaml');
 
     if (!fs.existsSync(ccsDir)) {

src/utils/shell-completion.ts

@@ -1,6 +1,7 @@
 import * as fs from 'fs';
 import * as path from 'path';
 import * as os from 'os';
+import { getCcsDir } from './config-manager';
 // import { execSync } from 'child_process'; // Currently unused
 
 type ShellType = 'bash' | 'zsh' | 'fish' | 'powershell' | null;
@@ -24,7 +25,7 @@ export class ShellCompletionInstaller {
 
   constructor() {
     this.homeDir = os.homedir();
-    this.ccsDir = path.join(this.homeDir, '.ccs');
+    this.ccsDir = getCcsDir();
     this.completionDir = path.join(this.ccsDir, 'completions');
     this.scriptsDir = path.join(__dirname, '../../scripts/completion');
   }