chore(codegen): drop .trix/client-lib; check tx3c's built-in rust-client

.github/scripts/codegen-check.sh

@@ -2,20 +2,19 @@
 #
 # CI artifact — not part of the SDK.
 #
-# Renders the .trix/client-lib codegen plugin against the shared transfer
+# Renders tx3c's built-in `rust-client` template against the shared transfer
 # fixture and verifies the result:
 #   - the expected public surface is generated, and
 #   - the rendered crate compiles.
 #
-# The template tracks the `tx3-sdk` in this repo, which may be ahead of the
-# crate published on crates.io — a PR lands the SDK and the template changes
-# together, before the release. So the rendered crate is compiled against the
-# in-repo `sdk/` crate via a `[patch.crates-io]` override: this verifies the
-# template and the SDK in the same checkout stay consistent. The generated
-# `Cargo.toml` still carries the real version requirement; only the source is
-# redirected.
+# The template ships inside tx3c and pins a published `tx3-sdk` range. The
+# rendered crate is compiled against the in-repo `sdk/` crate via a
+# `[patch.crates-io]` override, so an SDK change that would break the clients
+# the current tx3c generates fails here, before the SDK is released. The
+# generated `Cargo.toml` still carries the real version requirement; only the
+# source is redirected.
 #
-# Requires `tx3c` and `cargo` on PATH.
+# Requires `tx3c` (0.24.0 or later, which ships the built-in templates) and `cargo` on PATH.
 set -euo pipefail
 
 repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
@@ -25,7 +24,7 @@ trap 'rm -rf "$gen" "$gen_complex"' EXIT
 
 tx3c codegen \
   --tii "$repo_root/sdk/tests/fixtures/transfer.tii" \
-  --template "$repo_root/.trix/client-lib" \
+  --template rust-client \
   --output "$gen"
 
 for f in lib.rs Cargo.toml; do
@@ -67,8 +66,8 @@ for forbidden in \
   fi
 done
 
-# Compile against the SDK in this checkout — the template may require a
-# `tx3-sdk` version not yet published to crates.io.
+# Compile against the SDK in this checkout, so an unreleased SDK change is
+# checked against the client the current tx3c generates.
 cat >> "$gen/Cargo.toml" <<EOF
 
 [patch.crates-io]
@@ -84,7 +83,7 @@ cargo check --manifest-path "$gen/Cargo.toml"
 # the two things a transfer-only check cannot see.
 tx3c codegen \
   --tii "$repo_root/sdk/tests/fixtures/complex.tii" \
-  --template "$repo_root/.trix/client-lib" \
+  --template rust-client \
   --output "$gen_complex"
 
 # Local component refs must survive into the generated source. A raw string