feat: define stable frontend facade

[artrixdotdev]

Summary

• Add a public facade module for frontend-facing handles, typed torrent sources, commands, events, and snapshots.
• Re-export facade types through the current prelude while leaving export narrowing to Narrow libtortillas public exports and prelude to stable frontend API #223.
• Map existing engine/torrent exports into frontend snapshots and document the facade entrypoint in crate rustdoc.

Tests

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets -- -D warnings
• cargo nextest run --workspace
• cargo test -p libtortillas --doc

Closes #222

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 82a4e7c0-4c1b-4a7a-9573-7b355664415c

📥 Commits

Reviewing files that changed from the base of the PR and between 7797155 and 182b691.

📒 Files selected for processing (3)

• crates/libtortillas/src/facade.rs
• crates/libtortillas/src/lib.rs
• crates/libtortillas/tests/facade.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/define-stable-frontend-facade

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