Cleanup async tracebacks patterns builtins#2

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dylan-sutton-chavez merged 20 commits intomainfrom

May 9, 2026

refactor: remove complex number type and trig kit (Task 1.1)
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refactor: remove BigInt; trap i64 overflow as OverflowError (Task 1.2)
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refactor(lexer): harden match/case to keywords; keep type soft (Task 1.3)
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refactor(format): drop e/E/g/G/n/c/% format types (Task 1.4)
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refactor: drop type-alias, ascii(), and chunk.annotations (Task 1.5)
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feat(vm): Class.method/attr access, sorted(key=) (Tasks 2.1-2.3)
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feat: setattr/delattr/slice/vars builtins; bytes parity; str/dict methods (Tasks 3.2-3.5)
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docs: align with pruned surface; new classes page (Task 5)
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feat(vm): cross-module multi-frame tracebacks with instr-level call carets (Task 3.1)
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feat(vm): real cooperative scheduler + time capability (Tasks 4.1-4.2)
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