docs: rename the native provider to @soulcraft/cor across public docs and JSDoc

The 3.0 native engine ships as @soulcraft/cor (brainy 8.x <-> cor 3.x are a
version-matched pair); the old @soulcraft/cortex package stays on the 2.x/7.x
line. Public docs and .d.ts-visible comments now name the correct package.
Historical 2.x contract references (e.g. the 2.3.1 read-side fallback) keep
the old name deliberately.

docs/eli5.md

@@ -11,7 +11,7 @@ next:
   - getting-started/quick-start
 ---
 
-# Brainy and Cortex — Explained Simply
+# Brainy and Cor — Explained Simply
 
 *A plain-language guide for anyone who wants to understand what this thing actually does.*
 
@@ -65,13 +65,13 @@ Brainy can narrow any result set down by exact labels or ranges in the same brea
 
 ---
 
-## What is Cortex?
+## What is Cor?
 
-Cortex is a turbocharger for Brainy.
+Cor is a turbocharger for Brainy.
 
 Same car. Same controls. Same fuel. You just swap in a faster engine under the hood, and everything that used to take a moment now happens instantly.
 
-Technically, Cortex is an optional plugin written in Rust — a lower-level language that runs much closer to the raw metal of your processor. It plugs into Brainy and takes over the most compute-intensive work: the distance calculations that power meaning search, the number-crunching behind live aggregates, and the set operations that drive label filtering.
+Technically, Cor is an optional plugin written in Rust — a lower-level language that runs much closer to the raw metal of your processor. It plugs into Brainy and takes over the most compute-intensive work: the distance calculations that power meaning search, the number-crunching behind live aggregates, and the set operations that drive label filtering.
 
 You install it with one line, register it with one call, and Brainy automatically uses it everywhere it can help.
 
@@ -83,9 +83,9 @@ Plain language:
 
 - **Searches** go from "the blink of an eye" to "faster than a blink." The overall speedup is **5.2× on average** across all operations.
 - **Live aggregates** are rebuilt using all CPU cores in parallel, so re-indexing large datasets takes a fraction of the time.
-- **Analytics** that aren't even possible in pure JavaScript — real-time anomaly detection, streaming percentile estimates, approximate unique counts — become available because Cortex brings the native capabilities required to run them efficiently.
+- **Analytics** that aren't even possible in pure JavaScript — real-time anomaly detection, streaming percentile estimates, approximate unique counts — become available because Cor brings the native capabilities required to run them efficiently.
 
-If Brainy is what makes knowledge fast, Cortex is what makes Brainy feel instant.
+If Brainy is what makes knowledge fast, Cor is what makes Brainy feel instant.
 
 ---
 
@@ -135,7 +135,7 @@ Brainy is the only row with every box checked. And it runs all of them in a sing
 
 Brainy scales from a quick experiment to serious production datasets without changing a line of code. Small datasets live entirely in memory. Larger ones spill to disk, where Brainy shards and compresses everything automatically. Need a backup or a copy? Snapshots are instant — the same API the whole way.
 
-Add Cortex and you also unlock memory-mapped storage — aggregate state lives directly in the operating system's memory with zero serialization overhead, as fast as the hardware allows.
+Add Cor and you also unlock memory-mapped storage — aggregate state lives directly in the operating system's memory with zero serialization overhead, as fast as the hardware allows.
 
 ---