feat: expose linked TinyBus module entry point

[senamakel]

Summary

• Add opt-in tinyvoice-module/static-link using TinyBus module_export_optional_static!, which selects dynamic exports by default and a Rust-addressable module in static builds.
• Expose tinyvoice_module::linked_module() for direct host registration.
• Pin TinyBus commit 433d9ed and use =0.1.2 registry dependency identities, with local Cargo patches for standalone builds.

Related issue

Depends on tinyhumansai/tinybus#29, which builds on merged #28. Ready condition: #29 is merged, this gitlink is reachable from upstream TinyBus, and CI passes. This PR remains a draft until then.

API or behavior changes

Additive public linked_module() under static-link. The default loadable module path and wire contract are unchanged.

Validation

• cargo fmt --manifest-path crates/tinyvoice-module/Cargo.toml --all -- --check
• cargo check --manifest-path crates/tinyvoice-module/Cargo.toml -p tinyvoice-module --offline
• cargo check --manifest-path crates/tinyvoice-module/Cargo.toml -p tinyvoice-module --features static-link --offline
• Full clippy, build, test, and coverage suites have not been rerun on this final commit.

Tests

The two feature builds verify both TinyBus macro expansions and the public root reexport. No runtime behavior changes were added in this package.

Documentation

The feature and root entry point are documented in this PR and by TinyBus #29.

Checklist

• The change is focused on static module registration.
• No lint levels were relaxed in this update.
• No secrets or environment contents are included.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4778ca5 and bf8e22f.

📒 Files selected for processing (3)

• crates/tinyvoice-module/Cargo.toml
• crates/tinyvoice-module/src/lib.rs
• crates/tinyvoice-module/src/service/mod.rs

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