Add general .gitignore for Xilinx Vivado/Vitis/SDK projects

Universal patterns using wildcard naming conventions:
- *.cache/ - Vivado IP cache
- *.gen/*/ip/*/sim/ - Generated sim files
- *.ip_user_files/sim_scripts/, *.ip_user_files/bd/ - IP user artifacts
- *.sim/ - Simulation directories
- *.runs/synth_1/ and *.runs/impl_1/* - Run outputs (keep control scripts)
- *.sdk/.metadata/, *.sdk/.sdk/ - SDK workspace state
- *.sdk/RemoteSystemsTempFiles/, *.sdk/SDK.log, *.sdk/webtalk/ - SDK logs

Preserved: sources, .xpr, .project, .cproject, .xci, .xsa, .bit, .elf,
           BSP files, run control scripts

Removed from index: cache, .metadata, export, tempdsa, RemoteSystemsTempFiles
(515 build artifact files)

# Conflicts:
#	Vitis_Classic/NewInstCal_bsp/export/NewInstCal_bsp/sw/NewInstCal_bsp/boot/fsbl.elf
#	Vitis_Classic/NewInstCal_bsp/export/NewInstCal_bsp/sw/NewInstCal_bsp/standalone_domain/bsplib/lib/liblwip4.a
#	Vitis_Classic/NewInstCal_bsp/export/NewInstCal_bsp/sw/NewInstCal_bsp/standalone_domain/bsplib/lib/libxil.a

.gitignore

@@ -0,0 +1,131 @@
+# ===========================================================================
+# General .gitignore for Xilinx Vivado / Vitis / SDK Projects
+# Works for ANY project folder following standard Xilinx directory structure
+#
+# Directory naming convention: <ProjectName>.<suffix>/
+#   e.g., Debug_FW.cache/, Debug_FW.gen/, Debug_FW.hw/, Debug_FW.runs/,
+#         Debug_FW.sim/, Debug_FW.srcs/, Debug_FW.ip_user_files/
+#   e.g., Debug_FW.sdk/ (SDK workspace, different structure)
+# ===========================================================================
+#
+# PRESERVED (committed):
+#   - Source files (.v, .vhdl, .bd, .xdc, .c, .h, .ld)
+#   - Project/workspace config files (.xpr, .project, .cproject)
+#   - IP configuration (.xci)
+#   - Generated HDL sources (in .gen/ but NOT sim/)
+#   - BSP files (system.mss, platform.tcl, etc.)
+#   - Output files (.xsa, .bit, .elf)
+#   - Hardware platform files (.hdf, ps7_init.*)
+#
+# IGNORED (build artifacts, workspace state, caches):
+# ===========================================================================
+
+# ----- Vivado Cache -----
+# Directory: <ProjectName>.cache/ - regenerated by Vivado
+*.cache/
+
+# ----- Vivado Generated Sources -----
+# Directory: <ProjectName>.gen/ - keep HDL, ignore sim files
+*.gen/*/ip/*/sim/
+*.gen/*/ip/*/sim_tlm/
+
+# ----- Vivado IP User Files -----
+# Directory: <ProjectName>.ip_user_files/ - keep mem_init, ignore sim scripts and bd
+*.ip_user_files/sim_scripts/
+*.ip_user_files/bd/
+
+# ----- Vivado Simulation -----
+# Directory: <ProjectName>.sim/
+*.sim/
+
+# ----- Vivado Runs (synthesis & implementation outputs) -----
+# Directory: <ProjectName>.runs/ - keep run control scripts, ignore outputs
+*.runs/synth_1/*.log
+*.runs/synth_1/*.jou
+*.runs/synth_1/*.vds
+*.runs/synth_1/*.rpt
+*.runs/synth_1/*.pb
+*.runs/synth_1/*.dcp
+*.runs/synth_1/*.bin
+*.runs/synth_1/*.bit
+*.runs/synth_1/.Xil/
+*.runs/synth_1/__synthesis_is_complete__
+*.runs/impl_1/*.log
+*.runs/impl_1/*.jou
+*.runs/impl_1/*.vdi
+*.runs/impl_1/*.rpt
+*.runs/impl_1/*.rpx
+*.runs/impl_1/*.pb
+*.runs/impl_1/*.dcp
+*.runs/impl_1/*.bin
+*.runs/impl_1/*.bit
+*.runs/impl_1/*.ltx
+*.runs/impl_1/*.wdf
+*.runs/impl_1/.Xil/
+*.runs/impl_1/*.tmp
+*.runs/impl_1/*.hwdef
+*.runs/impl_1/*.json
+*.runs/impl_1/*.hw
+*.runs/impl_1/*.bd
+*.runs/impl_1/*.dat
+*.runs/impl_1/*.csv
+*.runs/impl_1/*.xml
+*.runs/impl_1/*.h5
+*.runs/impl_1/*.lpx
+*.runs/impl_1/*.spn
+*.runs/impl_1/*.spnx
+*.runs/impl_1/*.xdci
+*.runs/impl_1/*.lck
+*.runs/impl_1/*.dmp
+*.runs/impl_1/*.mcs
+*.runs/impl_1/*.bit.bif
+*.runs/impl_1/*.bin.bif
+*.runs/impl_1/*.mcs.bif
+# Keep run control files
+!*.runs/impl_1/gen_run.xml
+!*.runs/impl_1/rundef.js
+!*.runs/impl_1/runme.sh
+!*.runs/impl_1/runme.bat
+!*.runs/synth_1/gen_run.xml
+!*.runs/synth_1/rundef.js
+!*.runs/synth_1/runme.sh
+!*.runs/synth_1/runme.bat
+!*.runs/.jobs/
+!*.runs/.jobs/vrs_config_*.xml
+
+# ----- SDK Workspace (Vivado SDK) -----
+# Directory: <ProjectName>.sdk/ - different structure (no dot before "sdk")
+# Keep: .project, .cproject, sources, BSP, hw_platform configs
+# Ignore: workspace metadata, build outputs, logs
+*.sdk/.metadata/
+*.sdk/.sdk/
+*.sdk/RemoteSystemsTempFiles/
+*.sdk/SDK.log
+*.sdk/webtalk/
+*.sdk/*/Debug/
+*.sdk/*/Release/
+*.sdk/*/bootimage/
+*.sdk/*_hw_platform_*/system_wrapper.bit
+*.sdk/*_hw_platform_*/system_*.bit
+
+# ----- General Build Artifacts -----
+*.swp
+*~
+*.bak
+*.tmp
+*.pyc
+__pycache__/
+*.o
+*.a
+*.so
+*.dll
+
+# ----- OS Files -----
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# ----- IDE / Editor temporary files -----
+*.swo
+*.orig
+*.rej