Critical bug in aud init.

Fix: Create .pf directory before writing files in indexer

  Commit Description:

  Fixed critical bug where `aud init` would fail on clean projects with:
  "Failed to write manifest: [Errno 2] No such file or directory"

  Cause:
  - The indexer tried to write to .pf/manifest.json without creating parent directory
  - `aud init` calls indexer directly, which had no directory creation logic
  - `aud full` worked because pipelines.py creates .pf/ before calling indexer

  Effect:
  - Users running `aud init` on fresh projects would get immediate failure
  - Only affected first-time users following README instructions
  - Did not affect `aud full` users or existing projects with .pf/ directory

  Solution:
  - Added Path().parent.mkdir(parents=True, exist_ok=True) before writing manifest
  - Added same logic before creating database file
  - Ensures .pf directory structure is created regardless of entry point

  This fix ensures both `aud init` and `aud full` work on clean projects.

theauditor/indexer_compat.py

@@ -266,6 +266,8 @@ def build_index(
 
     # Write manifest
     try:
+        # Ensure parent directory exists before writing
+        Path(manifest_path).parent.mkdir(parents=True, exist_ok=True)
         with open(manifest_path, "w", encoding="utf-8") as f:
             json.dump(files, f, indent=2, sort_keys=True)
     except Exception as e:
@@ -273,6 +275,9 @@ def build_index(
 
     # Create and populate database
     try:
+        # Ensure parent directory exists for database
+        Path(db_path).parent.mkdir(parents=True, exist_ok=True)
+        
         # Check if database already exists
         db_exists = Path(db_path).exists()