Initial commit: ADSP-219x disassembler, docs, test ROMs, analysis tools

- Standalone Python disassembler for 24-bit ADSP-219x instructions
- Complete instruction set reference (PDFs + extracted text)
- Architecture documentation and getting-started guide
- Test ROM generator with packed (3-byte) and padded (4-byte) formats
- r2pipe-based analysis script for radare2 integration

docs/GETTING_STARTED.md

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+# ADSP-219x Analysis Workflow (Air-Gapped 🛡️)
+
+## Phase 1: Preparation (Online)
+1. **Download and Copy**: Ensure the entire `adsp219x-re/` folder is on the air-gapped machine.
+2. **Setup Dependencies**: Ensure Python 3.8+ is installed. Radare2 must be on $PATH.
+3. **Verify Python**: `python3 -m pip install r2pipe` (if not already part of your r2 install).
+
+## Phase 2: Loading ROMs
+Use raw loading for ADSP-2191 ROMs:
+`r2 -a adsp2 -b 24 -m 0x0 my_rom.bin` 
+(Note: `-a` and `-b` are placeholders until a native plugin exists. We use raw mode.)
+
+## Phase 3: Automated Disassembly
+Run the standalone disassembler first to get a quick overview:
+`python3 disassembler/adsp219x_disasm.py my_rom.bin 3 > disassembly.txt`
+
+## Phase 4: Radare2 + Iaito Integration
+To use our custom Python disassembly inside radare2:
+1. Open the ROM in radare2.
+2. Run the analysis script via r2pipe:
+   `#!python analysis/analyze_rom.py` (Inside r2: `#!pipe python3 ...`)
+3. Use `iaito` to browse the memory with the comments generated by the script.
+
+## Phase 5: Debugging/Validation
+Compare your proprietary ROM against our test ROMs in `testrom/test_roms/`.
+If you find a new instruction type, add it to `disassembler/adsp219x_disasm.py` and submit!