drg-xmrig: fork of xmrig-hac with unified pow-hash share model

Port miner113's RX_DRAGONX mining model into the RX_HUSH path so DragonX
mining is identical in solo and pool mode:

- CpuWorker: filter EVERY hash on SHA256D(header + RandomX solution) (the
  block-bearing pow-hash) instead of the RandomX hash; submit the full
  32-byte nonce + rx_hash. Removes the fragile pool-mode dual-check that
  was dropping ~half of block candidates.
- Job: 32-byte nonce for RX_HUSH in pool mode too (was solo-only).
- JobResult: populate nonceBytes() on the standard 4-byte path.
- Client: submit a variable-width nonce (32-byte for DragonX) with a
  dynamically laid-out temp buffer.

Effect: shares and blocks use one metric, so the pool receives every block
candidate (no under-submission gap) and the hashrate is block-relevant.

Rebrand to drg-xmrig (version.h, build.sh, package.json, README) + add
PROTOCOL.md wire spec.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
-  "name": "xmrig",
-  "version": "3.0.0",
-  "description": "RandomX, CryptoNight and Argon2 miner",
+  "name": "drg-xmrig",
+  "version": "6.25.1",
+  "description": "DragonX RandomX (rx/dragonx) CPU miner",
   "main": "index.js",
   "directories": {
     "doc": "doc"
@@ -11,13 +11,13 @@
   },
   "repository": {
     "type": "git",
-    "url": "git+https://git.hush.is/dragonx/xmrig-hac.git"
+    "url": "git+https://git.dragonx.is/DragonX/drg-xmrig.git"
   },
   "keywords": [],
   "author": "",
   "license": "GPLv3",
   "bugs": {
-    "url": "https://git.hush.is/dragonx/xmrig-hac/issues"
+    "url": "https://git.dragonx.is/DragonX/drg-xmrig/issues"
   },
-  "homepage": "https://git.hush.is/dragonx/xmrig-hac#readme"
+  "homepage": "https://git.dragonx.is/DragonX/drg-xmrig#readme"
 }