docs: clean up completed timing plans, add VIC-20 architecture plan
Remove 6 completed timing architecture phase plans (5-9 + overview). Add comprehensive VIC-20 architecture plan covering: - 6502 CPU family trait hierarchy (MOS 6502, WDC 65C02) - Generic SRAM/ROM memory components - 6560/6561 VIC video chip design - 6522 VIA I/O chip design - Address bus architecture for memory-mapped I/O - Expansion port design - GUI adaptations for multi-system support - 6-phase implementation roadmap
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plans/vic20_architecture.md
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plans/vic20_architecture.md
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