fix: critical blob integrity regression with defense-in-depth architecture (v5.10.1)

CRITICAL BUG FIX: v5.10.0 regressed the v5.7.2 blob integrity bug, causing
100% VFS file read failure. This fix restores functionality with production-grade
defense-in-depth architecture and comprehensive testing.

Problem:
- v5.10.0 reintroduced bug where BlobStorage.read() hashed wrapped data
- Symptom: "Blob integrity check failed" on every VFS file read
- Impact: 100% failure rate in Workshop application
- Root Cause: Missing defense-in-depth unwrap verification

The Fix:
1. Defense-in-Depth Unwrapping
   - Added unwrap verification in BlobStorage.read() before hash check (line 342)
   - Added unwrap for metadata parsing (line 314)
   - Ensures data is always unwrapped regardless of adapter behavior

2. DRY Architecture
   - Created binaryDataCodec.ts as single source of truth
   - Refactored baseStorage to use shared utilities
   - All 8 storage adapters now use same implementation

3. Comprehensive Testing
   - Added TestWrappingAdapter that actually wraps like production
   - 3 new regression tests validate the fix
   - Tests exercise real wrapping scenario that caused the bug

Architecture Improvements:
- ✅ Defense-in-Depth: Unwrap at BOTH adapter and blob layers
- ✅ DRY Principle: Single source of truth in binaryDataCodec.ts
- ✅ Works Across ALL Storage Adapters (8 total)
- ✅ Prevents Future Regressions: Real wrapping tests

Files Changed:
- NEW: src/storage/cow/binaryDataCodec.ts (single source of truth)
- FIXED: src/storage/cow/BlobStorage.ts (defense-in-depth unwrap)
- REFACTORED: src/storage/baseStorage.ts (uses shared codec)
- NEW: tests/helpers/TestWrappingAdapter.ts (real wrapping adapter)
- ADDED: 3 regression tests in tests/unit/storage/cow/BlobStorage.test.ts
- UPDATED: CHANGELOG.md, package.json (v5.10.1)

Related Issues:
- v5.7.2: Original bug - hashed wrapper instead of content
- v5.7.5: First fix - added unwrap to adapter (necessary but insufficient)
- v5.10.0: Regression - missing defense-in-depth in BlobStorage
- v5.10.1: Complete fix - defense-in-depth + DRY + tests

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

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

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@soulcraft/brainy",
-  "version": "5.10.0",
+  "version": "5.10.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@soulcraft/brainy",
-      "version": "5.10.0",
+      "version": "5.10.1",
       "license": "MIT",
       "dependencies": {
         "@aws-sdk/client-s3": "^3.540.0",