Add learning tools: Anki deck, IR quiz, reading order, trace exercises
tools/anki_gen.py: generates 389-card Anki deck (.apkg) from hand-crafted
YAML + auto-parsed source (IrOp variants, memory constants, error types,
peephole patterns, primitive registrations, boot.fth defs, Runtime trait).
tools/anki_data.yaml: 71 hand-crafted cards covering architecture, design
decisions, ForthVM internals, codegen, optimizer, boot.fth, control flow,
Runtime trait, and testing infrastructure.
tools/ir_quiz.py: interactive terminal quiz (41 exercises) — predict
optimized IR for Forth code (constant fold, peephole, strength reduce,
DCE, tail call, inlining).
tools/reading_order.md: guided 23-step codebase reading sequence.
tools/trace_exercises.md: 20 trace-the-compilation exercises with answers.
tools/architecture.txt: single-page ASCII system reference.
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