chore(hooks): route lint/test/perf through soldr instead of uv run cargo

[zackees]

Summary

• The PostToolUse lint hook (./lint) and the Stop hook (ci/lint.py + ci/test.py) shell out to uv run cargo. On Windows that resolves to a different host triple than soldr cargo (x86_64-pc-windows-gnu vs x86_64-pc-windows-msvc), so the same target/debug/ cannot be shared. Every Stop fired a target-triple mismatch cascading across 30+ crates.
• tool_guard.py already blocks uv run cargo in shell tool calls, but it doesn't catch subprocess invocations from inside Python — these four scripts slipped through.
• Routes every cargo/rustfmt call through uv run soldr ... so the rustup-managed msvc-host toolchain is the single source of truth for target/debug/.

Test plan

• uv run --script ci/lint.py — clean post-patch (workspace clippy -D warnings)
• uv run --script ci/test.py -p fbuild-library-select — 16/16 passing
• CI green on Linux + macOS + Windows

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Run ID: bcc8aef4-72b2-4729-a160-7b68d0fb8965

📥 Commits

Reviewing files that changed from the base of the PR and between c1a267c and 4cbd092.

📒 Files selected for processing (4)

• ci/lint.py
• ci/test.py
• lint
• perf

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/hooks-route-rust-through-soldr

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