fix: exclude __words__ keyword index from corruption detection and getStats()

The __words__ keyword index stores 50-5000 entries per entity (one per
word), which inflated avg entries/entity well above the corruption
threshold of 100. This caused:

1. validateConsistency() to falsely detect corruption on every startup,
   triggering unnecessary clearAllIndexData() + rebuild() cycles
2. getStats() to log false "Metadata index may be corrupted" warnings
   and report inflated totalEntries/totalIds stats

Both methods now skip __words__ when counting, so stats and health
checks reflect metadata fields only (noun, type, createdAt, etc.).
Keyword search is unaffected since the __words__ field index itself
is not modified.

src/augmentations/intelligentImport/handlers/imageHandler.ts

@@ -1,5 +1,5 @@
 /**
- * Image Import Handler (v5.8.0 - Pure JavaScript)
+ * Image Import Handler
  *
  * Handles image files with:
  * - EXIF metadata extraction (camera, GPS, timestamps) via exifr
@@ -7,7 +7,7 @@
  * - Support for JPEG, PNG, WebP, GIF, TIFF, BMP, SVG
  *
  * NO NATIVE DEPENDENCIES - Pure JavaScript implementation
- * Replaces Sharp (v5.7.x) with lightweight pure-JS alternatives
+ * Replaces Sharp with lightweight pure-JS alternatives
  */
 
 import { BaseFormatHandler } from './base.js'
@@ -96,7 +96,7 @@ export interface ImageHandlerOptions extends FormatHandlerOptions {
  * Enables developers to import images into the knowledge graph with
  * full metadata extraction.
  *
- * v5.8.0: Pure JavaScript implementation (no native dependencies)
+ * Pure JavaScript implementation (no native dependencies)
  */
 export class ImageHandler extends BaseFormatHandler {
   readonly format = 'image'