usb: enumerate as "Spore" via a vendored descriptor override (no submodule edits)

The USB VID/PID/name live in libDaisy's src/usbd/usbd_desc.c as unguarded #defines,
so they can't be overridden with -D. Instead vendor a copy as src/usb_identity.c with
Product="Spore", Manufacturer="rainybit" and add it to C_SOURCES. Because the ELF is
linked as $(CXX) <our objects> ... -ldaisy, our descriptor symbols satisfy all refs and
libDaisy's usbd_desc.o is never pulled from the archive — the submodule stays pristine
and reproducible. Verified: ELF contains "Spore", not "Daisy Seed Built In".

VID/PID kept at stock Daisy/STM values (documented one-line edit for productization).
Also add the USB include paths to .vscode for IntelliSense.

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

Author: Joakim Langkilde

.vscode/c_cpp_properties.json

@@ -9,6 +9,8 @@
         "${workspaceFolder}/lib/libDaisy/Drivers/CMSIS/Include",
         "${workspaceFolder}/lib/libDaisy/Drivers/CMSIS/Device/ST/STM32H7xx/Include",
         "${workspaceFolder}/lib/libDaisy/Drivers/STM32H7xx_HAL_Driver/Inc",
+        "${workspaceFolder}/lib/libDaisy/src/usbd",
+        "${workspaceFolder}/lib/libDaisy/Middlewares/ST/STM32_USB_Device_Library/Core/Inc",
         "${workspaceFolder}/lib/DaisySP/Source"
       ],
       "defines": ["STM32H750xx", "CORE_CM7", "USE_HAL_DRIVER", "ARM_MATH_CM7"],

CHANGELOG.md

@@ -5,7 +5,10 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/); this pr
 uses [Semantic Versioning](https://semver.org/) (`vMAJOR.MINOR.PATCH`).
 
 ## [Unreleased]
-- Custom USB vendor/product ID and device name.
+- USB device name: the pedal now enumerates as **"Spore"** (manufacturer "rainybit")
+  instead of "Daisy Seed Built In", via a vendored `src/usb_identity.c` descriptor
+  override. VID/PID kept at the stock Daisy/STM values (a real custom VID/PID is a
+  one-line edit there, deferred until productization).
 
 <!--
 Releasing:

Makefile

@@ -13,6 +13,11 @@ USE_DAISYSP_LGPL = 1
 # (All mode/io/mod code is header-only and pulled in via main.cpp.)
 CPP_SOURCES = src/main.cpp src/hothouse.cpp
 
+# USB identity override (enumerate as "Spore"): a copy of libDaisy's usbd_desc.c.
+# Linked before -ldaisy so its descriptor symbols win over the archive's copy. See
+# the header note in the file for how to set a real VID/PID before shipping a product.
+C_SOURCES += src/usb_identity.c
+
 # Header search root so "config/...", "io/...", "modes/...", "hothouse.h" resolve.
 C_INCLUDES = -Isrc