Generate Rust bindings that match Bazel-built V8 archives (#57644)

## Why

Pre-generated bindings can disagree with native V8 layouts, including CppGC member storage and the inline typed-array size. Source archives need bindings generated with the same headers, defines, and target configuration.

## What changed

- Generate bindings through Bazel using the archive's C++ compilation metadata, and include them in Darwin and Linux release pairs and source builds.
- Select native Windows MSVC archives and matching bindings together with `--//:rusty_v8_from_source=true`, and generate target-specific Windows GNU bindings.
- Pin a corrected `rusty_v8` revision for Cargo and Bazel, and track native Windows LLVM tools and resources as action inputs so pin changes invalidate cached actions.
- Run release and canary Cargo smoke tests with explicit target triples, required Linux linkers, and `--include-ignored`.

## Testing

Add `codex-v8-poc` coverage for CppGC member size, alignment, tracing, and weak references; typed-array contents and backing-store promotion; and microtask queues across garbage collection and context reassignment. Enable the otherwise ignored CppGC ABI checks for Bazel source builds and staged release smoke tests.

GitOrigin-RevId: 9edfa057a0ef2e323543bb8132c070d336ded1b2

.github/workflows/v8-canary.yml

@@ -109,13 +109,13 @@ jobs:
             sandbox: true
             target: aarch64-unknown-linux-gnu
             variant: ptrcomp-sandbox
-          - runner: macos-15-xlarge
+          - runner: macos-15-intel
             bazel_config: ci-macos
             platform: macos_amd64
             sandbox: false
             target: x86_64-apple-darwin
             variant: release
-          - runner: macos-15-xlarge
+          - runner: macos-15-intel
             bazel_config: ci-macos
             platform: macos_amd64
             sandbox: true
@@ -177,6 +177,7 @@ jobs:
         uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
         with:
           toolchain: "1.95.0"
+          targets: ${{ matrix.target }}
 
       - name: Build Bazel V8 release pair
         env:
@@ -230,6 +231,26 @@ jobs:
 
           python3 .github/scripts/rusty_v8_bazel.py stage-release-pair "${stage_args[@]}"
 
+      # Larger Linux runner images may omit the host linker used by Cargo build scripts.
+      - name: Install native Linux Cargo smoke dependencies
+        if: ${{ runner.os == 'Linux' }}
+        env:
+          TARGET: ${{ matrix.target }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          packages=(build-essential)
+          if [[ "${TARGET}" == *-musl ]]; then
+            packages+=(musl-tools)
+          fi
+          sudo apt-get update -y
+          sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends "${packages[@]}"
+          if [[ "${TARGET}" == *-musl ]]; then
+            # Use musl only for target links; Cargo build scripts still link on the glibc host.
+            linker_var="CARGO_TARGET_${TARGET^^}_LINKER"
+            echo "${linker_var//-/_}=$(command -v musl-gcc)" >> "${GITHUB_ENV}"
+          fi
+
       - name: Smoke test staged artifact with Cargo
         env:
           SANDBOX: ${{ matrix.sandbox }}
@@ -238,16 +259,6 @@ jobs:
         run: |
           set -euo pipefail
 
-          host_arch="$(uname -m)"
-          case "${TARGET}:${host_arch}" in
-            x86_64-apple-darwin:x86_64|aarch64-apple-darwin:arm64|x86_64-unknown-linux-gnu:x86_64|aarch64-unknown-linux-gnu:aarch64)
-              ;;
-            *)
-              echo "Skipping non-native Cargo smoke for ${TARGET} on ${host_arch}."
-              exit 0
-              ;;
-          esac
-
           archive="$(find "dist/${TARGET}" -maxdepth 1 -type f -name 'librusty_v8_*.a.gz' -print -quit)"
           binding="$(find "dist/${TARGET}" -maxdepth 1 -type f -name 'src_binding_*.rs' -print -quit)"
           if [[ -z "${archive}" || -z "${binding}" ]]; then
@@ -255,10 +266,11 @@ jobs:
             exit 1
           fi
 
-          cargo_args=(test -p codex-v8-poc)
+          cargo_args=(test -p codex-v8-poc --target "${TARGET}")
           if [[ "${SANDBOX}" == "true" ]]; then
             cargo_args+=(--features sandbox)
           fi
+          cargo_args+=(-- --include-ignored)
 
           (
             cd codex-rs