lib/SD: Arduino-ESP32 3.3.12's SD library, as it comes

A project library named SD takes the framework's place at link time.
Unchanged here (Apache-2.0), so that the next commit shows exactly what
roro9stack changes in it, and a later framework update can be compared.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

lib/SD/library.json

@@ -0,0 +1,7 @@
+{
+  "name": "SD",
+  "version": "3.3.12",
+  "description": "roro9stack's copy of Arduino-ESP32's SD library (Apache-2.0), shadowing the framework's. Only sd_diskio.cpp is changed (marked \"roro:\"): it records why a write failed and resends a block the card rejects. See issue #21.",
+  "frameworks": "arduino",
+  "platforms": "espressif32"
+}