Standardize .gitignore and untrack build/IDE artifacts; keep firmware images only.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -1,63 +1,96 @@
-# macOS
-.DS_Store
-**/.DS_Store
+# =============================================================================
+# STM32 / ARM GCC / STM32CubeIDE — standardized firmware .gitignore
+# Track: sources + final firmware images (*.elf *.bin *.hex *.srec)
+# Ignore: build intermediates, IDE noise, logs, captures, backups
+#
+# NOTE: Only root /Debug /Release /Build are build dirs.
+# Do NOT use **/Debug — on Windows (core.ignorecase) that also matches
+# source folders like Libs/**/DEBUG/.
+# =============================================================================
 
-# Temporary/editor files
-*.swp
-*.swo
-*~
-*.tmp
-*.bak
+# -----------------------------------------------------------------------------
+# Build dirs (project root only): ignore all, then re-include firmware images
+# -----------------------------------------------------------------------------
+/Debug/*
+!/Debug/
+/Release/*
+!/Release/
+/Build/*
+!/Build/
 
-# STM32CubeIDE build intermediates
-Debug/**/*.o
-Debug/**/*.d
-Debug/**/*.su
-Debug/**/*.cyclo
-Debug/**/*.mk
-Debug/**/*.lst
-Debug/**/*.log
-Debug/**/*.tmp
-Debug/**/*.a
-Debug/**/*.obj
-
-Release/**/*.o
-Release/**/*.d
-Release/**/*.su
-Release/**/*.cyclo
-Release/**/*.mk
-Release/**/*.lst
-Release/**/*.log
-Release/**/*.tmp
-Release/**/*.a
-Release/**/*.obj
-
-# Generic C/C++ intermediates
+# -----------------------------------------------------------------------------
+# Object / dependency / analysis outputs (any path)
+# -----------------------------------------------------------------------------
 *.o
 *.obj
 *.d
 *.su
-*.gch
-*.pch
-*.ilk
-*.exp
-*.idb
-*.pdb
-*.dSYM/
+*.cyclo
 
-# Preserve firmware artifacts in git
-!*.hex
-!*.bin
-!*.srec
-!*.elf
+# -----------------------------------------------------------------------------
+# Generated make fragments (CubeIDE)
+# -----------------------------------------------------------------------------
+*.mk
+makefile
+Makefile
+objects.list
+objects.mk
+sources.mk
+subdir.mk
 
-# Eclipse local workspace metadata
-.metadata/
+# -----------------------------------------------------------------------------
+# Linker listings (not needed in repo)
+# -----------------------------------------------------------------------------
+*.map
+*.list
+
+# -----------------------------------------------------------------------------
+# Backups / temp
+# -----------------------------------------------------------------------------
+**/Backup/
+*.bak
+*.tmp
+*.swp
+*.swo
+*~
+
+# -----------------------------------------------------------------------------
+# IDE / tooling (local machine)
+# -----------------------------------------------------------------------------
+.settings/
+.mxproject
 .externalToolBuilders/
-
-# Optional local launch configs
+.metadata/
+.idea/
 *.launch
+*.code-workspace
 
-# VS Code local settings
-.vscode/
+# -----------------------------------------------------------------------------
+# Logs / analyzer captures
+# -----------------------------------------------------------------------------
+log.txt
+log*.txt
+*.log
+*.asc
 
+# -----------------------------------------------------------------------------
+# OS junk
+# -----------------------------------------------------------------------------
+.DS_Store
+Thumbs.db
+
+# =============================================================================
+# Keep final firmware images under root build dirs
+# =============================================================================
+!/Debug/*.elf
+!/Debug/*.bin
+!/Debug/*.hex
+!/Debug/*.srec
+!/Release/*.elf
+!/Release/*.bin
+!/Release/*.hex
+!/Release/*.srec
+!/Build/*.elf
+!/Build/*.bin
+!/Build/*.hex
+!/Build/*.srec