Add linked TinyBus module entrypoint

[senamakel]

Summary

Adds static-link (with linked as an alias) and uses module_export_optional_static! to select the Rust-addressable module export. The normal build keeps its dynamic C ABI. The nested TinyBus checkout is pinned to commit 433d9ed from tinyhumansai/tinybus#29.

Draft readiness condition: TinyBus PR #29 must merge, then this repository must pin its merged commit and pass CI before this PR is marked ready or merged.

Related issue

None.

API or behavior changes

With static-link, Rust hosts can call tinybox::linked_module() to register this module in process. linked remains an alias for static-link.

Validation

• cargo check -p tinybox-module --locked
• cargo check -p tinybox-module --features static-link --locked
• cargo fmt --all -- --check
• git diff --check

Tests

TinyBus PR #29 covers the shared module export behavior. Full repository suites were not run locally.

Documentation

The crate-root function has rustdoc; the TinyBus dependency PR documents the host registration API.

Checklist

• The change is focused on linked module integration
• No new #[ignore] or relaxed lint settings
• No secrets or credentials in the change

[coderabbitai]

Warning

Review limit reached

• Run on-demand review

_{This review includes 4 billable files and costs up to $1.00.}

Or wait 50 minutes for your next included review.

Check out review usage here.

View limit details

Limit details: You’ve used the included review currently available.

Learn how review limits work.

Review configuration:

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 7433d224-4743-4cf7-96a8-056ffe2b7976

📥 Commits

Reviewing files that changed from the base of the PR and between e8828da and 5e9053c.

📒 Files selected for processing (4)

• Cargo.toml
• crates/tinybox-module/Cargo.toml
• crates/tinybox-module/src/lib.rs
• crates/tinybox-module/src/tinybus_module/mod.rs

---

_{Comment @coderabbitai help to get the list of available commands.}