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. TinyJevClient and TinyBus use exact version dependencies with local workspace patches. 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 tinydesktop::linked_module() to register this module in process. linked remains an alias for static-link.

Validation

• cargo check -p tinydesktop --locked
• cargo check -p tinydesktop --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

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