chore(deps): updated vihaco dependency to 0.4.0

[robpatterson13]

Summary

Migrates ppvm-vihaco and vihaco-circuit-isa from vihaco 0.1.1 to vihaco 0.4.0.

Changes

• Migrates PPVM to vihaco 0.4.0 surface/runtime instruction APIs.
• Replaces the legacy parser pipeline with v0.4 parsing and resolution.
• Generates the circuit instruction set with vihaco::component!.
• Enforces one-to-one source-to-runtime instruction lowering.
• Updates .sst syntax, including:

  const.u64 0       → cpu::cpu.const u64, 0
  eq.u32            → cpu::cpu.eq u32
  circuit.h         → circuit::circuit.h
  ret               → cpu::cpu.ret 0
  @label:           → cpu::cpu.label @label

• Resolves branch targets and function calls to runtime addresses.
• Adds bytecode v2 serialization for function tables, labels, signatures, and main_function.
• Updates CLI, TUI, examples, embedded programs, and test fixtures.
• Adds and updates migration documentation in docs/changelog/vihaco-0.4.md.

Verification

• cargo test --workspace
• cargo check -p ppvm-vihaco
• cargo test -p ppvm-vihaco
• cargo test -p vihaco-circuit-isa
• cargo test -p ppvm-cli
• cargo test -p ppvm-tui

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