[BLOCKER] Fix stackfuture edition 2024 dependency

[jbdevprimary]

Summary

Compilation fails because the stackfuture crate requires Rust edition 2024 which is not stable.

Error

error: failed to parse manifest at `.../stackfuture-0.3.1/Cargo.toml`
Caused by:
  feature `edition2024` is required

Required Changes

1. Find alternative to stackfuture or pin to older version
2. Update Cargo.toml dependencies
3. Verify compilation with stable Rust

Acceptance Criteria

• cargo check --all passes on stable Rust
• cargo test --all passes
• WASM target compiles successfully