Fix crates.io publish failure: rename package to vrillabs-helios

[Copilot]

The "Publish helios to crates.io" job was failing because publish-crate.yml already referenced the crates.io package name vrillabs-helios (required since helios is already published by another author), but rs/helios/Cargo.toml still declared name = "helios", causing cargo metadata to fail with vrillabs-helios package not found in cargo metadata output.

Package rename

• Changed [package].name in rs/helios/Cargo.toml from helios to vrillabs-helios; binary and lib crate names remain helios, so the CLI and import paths are unaffected.
• Updated rs/Cargo.lock to match the renamed package, repositioned alphabetically, with no dependency version changes.

Workflow fixes

• publish-crate.yml: cargo update -p helios → cargo update -p vrillabs-helios.
• release.yml: cargo build --release --locked -p helios → -p vrillabs-helios (this selector also targets the package by name, not the binary).

# rs/helios/Cargo.toml
[package]
name = "vrillabs-helios"   # was "helios"

[Copilot]

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