Add complete downstream API gate

RUSTREWRITE.md

@@ -62,12 +62,13 @@ The current workspace is a structural baseline, not a working client:
 - all nine sample/tool projects have compiling Rust binary targets;
 - the 128 TestClient command source files are retained as a command inventory.
 
-No generated type shells remain pending: all cataloged members are callable.
-`api/SURFACE.tsv` is still an inventory aid, not proof of API coverage: it
-records declaration lines but does not fully parse multiline signatures.
-Likewise, a generated `pending` test is a parity placeholder, not a semantic
-translation. **This repository is therefore at Stage 0 and still requires the
-independent downstream API audit and full test-suite gate.**
+No generated type shells remain pending: all cataloged members are callable,
+and the standalone downstream fixture names or invokes all 3,066 types and
+30,789 members with zero exclusions. `api/SURFACE.tsv` is still an inventory
+aid, not proof of API coverage: it records declaration lines but does not fully
+parse multiline signatures. Likewise, a generated `pending` test is a parity
+placeholder, not a semantic translation. **The full public API signature shim
+gate is complete; semantic test translation is the next stage.**
 
 The avatar-facing slice preserves the C# agent, movement/camera, appearance and
 outfit-policy, inventory/AIS/store, asset/cache, avatar, and animesh concepts.
@@ -89,8 +90,8 @@ Blocking compatibility surfaces stay explicit, stored callbacks and events use
 typed ownership, and parser/voice bodies fail before performing parsing,
 networking, device access, or proprietary/native work.
 
-No functional porting starts until both missing gates are complete across the
-entire workspace, rather than one crate at a time:
+No functional porting starts until the semantic test-suite gate is complete
+across the entire workspace, rather than one crate at a time:
 
 1. every public C# type and member has a reviewed, callable Rust signature with
    an intentionally failing body;
@@ -706,7 +707,11 @@ Required gates:
 
 ```sh
 cargo fmt --all -- --check
+python3 tools/generate_rust_mapping.py --check
+python3 tools/generate_api_shims.py --check
+python3 tools/check_api_coverage.py
 cargo check --workspace --all-targets
+cargo check --locked --manifest-path tests/api-compile/Cargo.toml
 cargo test --workspace --no-run
 cargo clippy --workspace --all-targets --all-features -- -D warnings
 cargo doc --workspace --no-deps