fix(ci): set linker=platform-default for native cross-builds

[zackees]

Why

The v2.2.4 release-auto run failed at the aarch64-unknown-linux-musl native build:

/usr/bin/ld: <sysroot>/.../aarch64-unknown-linux-musl/lib/self-contained/crt1.o:
    error adding symbols: file in wrong format
clang: error: linker command failed with exit code 1

clang fell back to host /usr/bin/ld (x86_64) instead of zig's cross-linker, so the aarch64 cross-objects couldn't be linked.

Root cause

setup-soldr's linker: input defaults to "", which auto-injects fast (mold-or-rust-lld on Linux) via SOLDR_LINKER. That clobbers the per-target linker that cargo zigbuild relies on for cross-compilation.

setup-soldr documents linker: platform-default as the explicit opt-out that keeps whatever cargo config / rust-toolchain.toml specifies.

Fix

Set linker: platform-default only on template_native_build.yml (release native binaries). All host-native build workflows (check-*, fmt, msrv, docs, board builds, bench-205, acceptance-205) continue to use the fast default — it's a clear win there.

Test plan

• CI on this PR passes (this template only fires from release-auto.yml / build.yml workflow_call — won't run inline on PR)
• After merge, manually trigger release-auto.yml via workflow_dispatch — no tag yet for v2.2.4, so prepare will fire the full build + publish + pypi pipeline
• All 4 native builds succeed, including aarch64 musl

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 282e583 and aecbc7f.

📒 Files selected for processing (1)

• .github/workflows/template_native_build.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/native-build-linker

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