docs(8.0): Phase F — deep clean across 21 docs

Aligned every public doc to the 8.0 contract: filesystem + memory adapters
only, vector index provider terminology (config.vector with recall +
quantization + persistMode knobs), no cloud storage adapters, no closed-
source product names.

Tier 1 — heavier rewrites:
- docs/architecture/storage-architecture.md
- docs/architecture/data-storage-architecture.md
- docs/architecture/distributed-storage.md DELETED — content was 100%
  cloud-coordination examples with no 8.0 substance.
- docs/guides/distributed-system.md DELETED — same reason; no inbound refs.
- docs/SCALING.md rewritten for single-node guidance.
- docs/PLUGINS.md, docs/augmentations/{COMPLETE-REFERENCE,README}.md:
  HnswProvider→VectorIndexProvider, hnsw→vector key.
- docs/PERFORMANCE.md, docs/BATCHING.md cloud-detection + sharding
  sections replaced with single-node vector tuning + filesystem framing.

Tier 2 — surgical renames + cloud-section deletions:
- architecture/{index,initialization-and-rebuild,overview}.md
- transactions.md, DEVELOPER_LEARNING_PATH.md
- vfs/{VFS_API_GUIDE,COMMON_PATTERNS}.md
- api/README.md, guides/{inspection,import-flow}.md

Tier 3 — light edits:
- docs/README.md, architecture/augmentation-system-audit.md

MIGRATION-V3-TO-V4.md untouched (internal migration doc, no stale terms).

docs/guides/inspection.md

@@ -17,10 +17,7 @@ store. This guide covers the safe ways to query a running Brainy directory.
 
 ## The cardinal rule
 
-**Never open a second writer on the same directory.** It will throw on
-filesystem storage; on cloud storage it'll silently overwrite the live
-writer's state. Use `Brainy.openReadOnly()` or the `brainy inspect` CLI
-instead.
+**Never open a second writer on the same directory.** Filesystem storage will throw, and any other write path will corrupt the live writer's state. Use `Brainy.openReadOnly()` or the `brainy inspect` CLI instead.
 
 ## The CLI is the fastest path
 
@@ -97,7 +94,7 @@ $ brainy inspect health /data/brain
 {
   "overall": "warn",
   "checks": [
-    { "name": "index-parity", "status": "pass", "message": "HNSW (1851) and metadata (1851) agree." },
+    { "name": "index-parity", "status": "pass", "message": "Vector (1851) and metadata (1851) agree." },
     { "name": "field-registry", "status": "pass", "message": "23 fields registered for 1851 entities." },
     { "name": "seeded-records", "status": "warn", "message": "15 entities tagged _seeded:true." },
     { "name": "writer-heartbeat", "status": "pass", "message": "Writer healthy (PID 1774431...)." }