chore: release v0.64.0

[SequeI]

Linked Issue

Closes #

Summary

Test Plan

Checklist

• An issue exists and is linked above
• All commits are signed-off, using DCO
• All new code follows the project's coding standards (CLAUDE.md) and is covered by tests
• Public-facing changes are paired with documentation updates
• Release note has been added to CHANGELOG.md if needed

[github-actions]

PR Review Summary

Size

Metric	Value
Lines added	+80
Lines removed	-10
Total changed	90
Classification	Medium (50–300 lines)

Affected crates

• crates/nono (core library) — careful review required. This is the security-critical sandbox primitive. A bug here bypasses OS-level isolation for every downstream user.
• crates/nono-proxy — downstream consumers depend on this crate. API or behaviour changes will affect external callers; treat any breaking change with extra scrutiny.
• crates/nono-cli — CLI changes. Verify argument parsing, flag documentation, and UX behaviour across supported platforms.
• bindings/c (C FFI) — ABI changes can silently break C callers. Confirm header and symbol compatibility.

Blast radius — Moderate

This PR touches: source code,documentation

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[gemini-code-assist]

Code Review

This pull request bumps the version of the nono project and its associated crates (nono-cli, nono-proxy, and nono_ffi) from 0.63.0 to 0.64.0. This includes updating the Cargo.toml files, Cargo.lock, and adding the release notes for version 0.64.0 to CHANGELOG.md. There are no review comments, and I have no additional feedback to provide.

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