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diff --git a/.gitignore b/.gitignore
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+# GHDL build artifacts
+*.o
+e~*.o
+work-obj*.cf
+tb_pic
+tb_stack
+
+# Simulation output
+*.vcd
+
+# Synthesis / P&R outputs
+*.json
+!PIC/hdl-prj.json
+*.fs
+*_pnr.json
+*_timing.json
+
+# SDCC compiler outputs
+*.asm
+*.cod
+*.lst
+*.ihx
+program.hex
+# Keep test_uart.hex — it's the assembled firmware
+# (remove this comment and add test_uart.hex here if you regenerate it from source)
+
+# Python cache
+__pycache__/
+*.pyc
+.mypy_cache/
+
+# Editor / OS junk
+.DS_Store
+*~