Prepare portable t2w release and docs Constraint: v1 ships as portable binaries before native installers. Confidence: high Scope-risk: moderate Directive: Keep release artifacts portable until CLI and Studio contracts stabilize. Tested: cargo fmt --all --check; cargo build --locked --release --bin t2w --bin t2w-studio; cargo test --workspace; cargo build --locked --release --target x86_64-pc-windows-msvc --bin t2w --bin t2w-studio