feat: add standalone WIP Text View signatures

Render one Object or paired Interface entity without path/context, lookups or wire-schema changes. Preserve declarations, summaries, optional/unit and empty distinctions; validate protocol semantics and bounded input before rendering. Add five spec/nested goldens and 13 external API tests plus a standalone doctest.

Validation: cargo fmt --all -- --check; cargo check --workspace --all-targets; cargo test --workspace --all-targets; cargo test --workspace --doc; nix develop -c bash (cargo clippy --workspace --all-targets -- -D warnings, RUSTDOCFLAGS='-D warnings' cargo doc --workspace --no-deps, cargo run --package wip-public-api-example); git diff --check. All passed. Default shell lacks clippy; declared Nix dev shell supplied it.

crates/wip-text-view/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "wip-text-view"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+description = "Standalone Object and Interface Text View signatures for WIP"
+license.workspace = true
+repository.workspace = true
+readme = "README.md"
+documentation = "https://docs.rs/wip-text-view"
+
+[dependencies]
+wip-protocol.workspace = true