Build tile charset mapping
Description
Using the PPU reading approach validated in the PPU spike, build a complete tile ID → character mapping for FF1's text tiles. Write scripts/build_tile_charset.py that reads tile patterns from the ROM or PPU nametable and matches them to known characters. Output: data/ff1_tile_charset.json with 60+ tile ID mappings covering letters, digits, punctuation, and special symbols. This JSON will be loaded by the dialog handler (task 050) and mode detector (task 025).
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m1
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