fix(ci): add missing tool input to install-action for cargo-llvm-cov

[jpoehnelt]

Root Cause

PR #341 ("ci: pin all actions to a sha") changed:

# Before — tool name passed as the tag
uses: taiki-e/install-action@cargo-llvm-cov

# After — SHA pin, tool name lost
uses: taiki-e/install-action@a37010d...

taiki-e/install-action uses the Git ref (tag) to determine which tool to install. When pinned to a SHA, the tag context is gone, so the action warns "no tool specified" and installs nothing. Every Coverage run since #341 was merged has been failing.

Fix

Add the explicit tool input:

uses: taiki-e/install-action@a37010d...
with:
  tool: cargo-llvm-cov

When It Broke

Commit d5d77d9 merged on 2026-03-09T13:52:49-06:00. All coverage runs since then have failed.

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