fix(spec): sync PROTOCOL_VERSION to 14.0.0 after the major release

The 14.0.0 Version Packages merge bumped package.json but the handshake
constant still said 13.0.0, so protocol-version.test.ts fails on main
and turns every open PR's Test Core red. Changesets cannot bump source
constants — the protocol bump must accompany each major release.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012oLzaP8n7A3YKFmgaHWC8H

Author: claude

.changeset/protocol-version-14.md

@@ -0,0 +1,5 @@
+---
+"@objectstack/spec": patch
+---
+
+Sync `PROTOCOL_VERSION` to `14.0.0` — the 14.0.0 release bumped `package.json` but the handshake constant still said 13, so `protocol-version.test.ts` failed on main for every PR. (Process note: the changesets Version PR cannot bump source constants; the protocol bump must accompany each major.)

packages/spec/src/kernel/protocol-version.ts

@@ -15,7 +15,7 @@
  * Kept in lockstep with the package's own major; `protocol-version.test.ts`
  * asserts it against `package.json` so the two cannot drift.
  */
-export const PROTOCOL_VERSION = '13.0.0';
+export const PROTOCOL_VERSION = '14.0.0';
 
 /** The protocol major as an integer — the value the handshake compares. */
 export const PROTOCOL_MAJOR: number = Number.parseInt(PROTOCOL_VERSION.split('.')[0]!, 10);