chore(release): 6.2.7 - simplify cloud storage to always-on write buffering

Performance & Consistency Improvements:
- Always-on write buffering for cloud adapters (GCS, S3, R2, Azure)
- Removes dynamic mode switching complexity (-204 lines)
- Consistent, predictable behavior regardless of load
- Preserves v6.2.6 cache-before-buffer fix

Cloud storage always benefits from batching - no reason for dynamic switching.

🤖 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": "6.2.6",
+  "version": "6.2.7",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@soulcraft/brainy",
-      "version": "6.2.6",
+      "version": "6.2.7",
       "license": "MIT",
       "dependencies": {
         "@aws-sdk/client-s3": "^3.540.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@soulcraft/brainy",
-  "version": "6.2.6",
+  "version": "6.2.7",
   "description": "Universal Knowledge Protocol™ - World's first Triple Intelligence database unifying vector, graph, and document search in one API. Stage 3 CANONICAL: 42 nouns × 127 verbs covering 96-97% of all human knowledge.",
   "main": "dist/index.js",
   "module": "dist/index.js",