Update devcontainer to latest WASM toolchain versions

[Copilot]

Devcontainer was using outdated versions of wasmtime (v15.0.1) and WASI SDK (v20). Updated to latest stable releases as of February 2026.

Version Updates

• wasmtime: v15.0.1 → v41.0.3
• WASI SDK: 20 → 25
• wit-bindgen: 0.16.0 → 0.52.0
• dev-wasm-feature: 0.0.13 → 0.0.16
• wasm-dev-base: 0.0.6 → 0.0.7

Updated PATH environment variable to reference new WASI SDK location (wasi-sdk-25.0).

Original prompt

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This section details on the original issue you should resolve

<issue_title>Devcontainer is out of date.</issue_title>
<issue_description>This devcontainer needs to be updated to the latest versions of wasmtime, etc.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Devcontainer is out of date. #1

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