Update all docs and test generator to match verified assembler opcodes

- README.md: Complete project overview with plugin status
- ARCHITECTURE.md: Fixed register tables (CNTR in REG1, not REG2)
- GETTING_STARTED.md: r2-native workflow, removed Python disasm refs
- PRACTICAL_EXAMPLE.md: Uses verified open21xx opcodes with bit layouts
- ROM_ANALYSIS_WALKTHROUGH.md: Updated format detection and r2 commands
- r2plugin/README.md: Simplified, points to assembler test ROM
- gen_isa_test.py: All opcodes from open21xx assembler with labels

r2plugin/README.md

@@ -1,44 +1,29 @@
 # ADSP-219x Radare2 Plugin
 
-This plugin adds support for the ADSP-219x architecture to radare2 and iaito.
+Native architecture plugin for disassembling ADSP-219x (including
+ADSP-2191) 24-bit instructions in radare2 and iaito.
 
-## Prerequisites
+## Build & Install
 
-- GCC
-- Radare2 5.8.0+ (uses the `RArchPlugin` API)
-- Python 3 (for test ROM generation)
+    make
+    make install
 
-## Installation
-
-```bash
-cd r2plugin
-make
-make install
-```
-
-To uninstall:
-```bash
-make uninstall
-```
+Requires: GCC, radare2 >= 5.8.0 (RArchPlugin API).
 
 ## Usage
 
-Load a binary file specifying the architecture and bits:
+    r2 -a adsp219x -b 24 firmware.bin
 
-```bash
-r2 -a adsp219x -b 24 firmware.bin
-```
+## Validation
 
-## Maintenance & Testing
+Compare against the assembler-verified test ROM:
 
-A test ROM generator is provided in the `testrom/` directory to verify instruction decoding accuracy.
+    r2 -a adsp219x -b 24 -q -c "pd 48" ../examples/isa_test.bin
 
-```bash
-cd testrom
-python3 gen_isa_test.py
-r2 -a adsp219x -b 24 -q -c "pd 42" test_roms/isa_test.bin
-```
+The test ROM (`isa_test.dsp`) was assembled with open21xx and
+contains known opcodes for all major instruction types.
 
 ## Coding Standards
 
-This project follows the **GNU Coding Standards** for C code and avoids hardcoded absolute paths in scripts.
+This plugin follows the GNU Coding Standards for C source code.
+No hardcoded absolute paths in any scripts.