fix(opencode): system llvm for cargo-llvm-cov (v3 concurrency)

[seonghobae]

Summary

Same llvm bake as #1081 / #1072 so OpenCode Review Dispatch coverage-evidence can run cargo-llvm-cov on Rust repos.

Why v3

• fix(opencode): install system llvm tools for coverage sandbox #1069 → stuck concurrency
• fix(opencode): system llvm for cargo-llvm-cov (v2 concurrency) #1081 @ 72f2c00 — Strix green, but OpenCode dispatch stays pending because a prior cancelled model-pool run for PR 1081 never releases the opencode-review-repository-dispatch-…-pr-1081 concurrency group (cancel-in-progress cannot preempt a non-terminating job).
• New PR number = free concurrency group.

Unblocks

• TEPP#46 commercialization serial (local CI green; blocked only on central OpenCode APPROVE after llvm bake).

Test plan

• Strix green on this head
• Central OpenCode coverage-evidence success
• OpenCode APPROVE (cannot self-approve)
• Squash-merge; close fix(opencode): system llvm for cargo-llvm-cov (v2 concurrency) #1081 / fix(opencode): bake llvm tools for Rust coverage-evidence #1072 as superseded
• Re-dispatch OpenCode for TEPP#46

Summary by CodeRabbit

• 개선 사항
  • 코드 커버리지 측정 환경에서 LLVM 도구를 안정적으로 사용할 수 있도록 개선했습니다.
  • 시스템에 설치된 LLVM 도구를 자동으로 감지하고 실행 경로를 설정합니다.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 33291f64-fc49-4b06-976a-38de79d5add1

📥 Commits

Reviewing files that changed from the base of the PR and between c47afc2 and 16d2301.

📒 Files selected for processing (1)

• .github/workflows/opencode-review-dispatch.yml

Included review availability: Your plan includes up to 1 review per rolling hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

Coverage 이미지에 LLVM을 설치하고 llvm-cov와 llvm-profdata를 고정 경로로 연결합니다. Rust toolchain 초기화는 명시적 설정이 없을 때 시스템 LLVM 경로를 사용합니다.

Changes

LLVM coverage toolchain

Layer / File(s)	Summary
Coverage 이미지의 LLVM 도구 설치 .github/workflows/opencode-review-dispatch.yml	이미지에 llvm를 설치합니다. llvm-cov와 llvm-profdata를 탐색한 후 /usr/local/bin에 심볼릭 링크를 생성합니다. LLVM_COV와 LLVM_PROFDATA를 고정 경로로 설정합니다.
Rust toolchain의 LLVM 경로 보완 .github/workflows/opencode-review-dispatch.yml	LLVM_COV 또는 LLVM_PROFDATA가 없으면 시스템에서 검색한 실행 파일 경로를 설정합니다. 기존 환경 변수는 유지합니다.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 16d23

This PR makes a localized workflow change to provide system LLVM tooling for coverage checks. No actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	제목은 system LLVM을 사용해 cargo-llvm-cov를 지원하는 주요 변경 사항을 명확하게 설명합니다.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/opencode-coverage-llvm-tools-v3

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[seonghobae]

Opened as v3 because #1081 concurrency group is held by non-terminating cancelled model-pool job. Priority unblock for ContextualWisdomLab/TEPP#46. Land this; close #1081/#1072 as superseded.