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llvm for cargo-llvm-cov (v2 concurrency) #1081 / fix(opencode): bake llvm tools for Rust coverage-evidence #1072 as superseded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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Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: f0863e37-f54a-4af3-8b82-37d20676bcc7

No actionable comments were generated in the recent review. 🎉

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.

[seonghobae]

Current-head repair (2026-08-19)\n\nRebased the isolated LLVM coverage-image/toolchain change onto current main and pushed 18af550. The workflow now installs LLVM, resolves versioned llvm-cov/llvm-profdata into fixed paths, and preserves rustup fallback behavior.\n\nEvidence: rebase clean and git diff --check passed. Local actionlint was attempted with a 30-second bound but the large workflow did not complete locally; protected GitHub checks must provide the authoritative workflow validation. No merge claimed.

[seonghobae]

Rebased onto current main 9e9f59f3; exact head 1e6a5e67; git diff --check passed. Local actionlint remains unavailable because the workflow lint command hung; no pass is claimed. Project #1 is In Progress.

[seonghobae]

@opencode-agent Review exact current head 1e6a5e67e12ca84c295b931a697b6442926747a5. All repository Actions checks are green. Verify the system LLVM coverage producer is pinned/bounded and fixes Rust cargo-llvm-cov evidence without weakening coverage semantics; submit the formal exact-head verdict.

[seonghobae]

Current-head evidence: rebased the system-LLVM/cargo-llvm-cov repair onto main bbedc1a. Exact head 52faa66. Focused Rust/coverage scheduler tests: 37 passed; changed hourly workflows passed actionlint; git diff --check passed. Protected hosted checks remain; no bypass used.

[seonghobae]

Rebased Rust coverage image/toolchain fix onto current main@c47bee59. Exact head: 7f5bb2f. Adds pinned system LLVM discovery and explicit LLVM_COV/LLVM_PROFDATA fallback while retaining rustup preview preference and fail-closed missing-tool evidence. Evidence: 68 adjacent OpenCode tests passed; diff check passed. The large hosted actionlint invocation timed out without diagnostics; no local syntax failure was emitted.

[seonghobae]

@OpenCode Please review exact current head 7f5bb2f against base main@c47bee591c3d95bd305f2130833ed3a4780d2d1d.

[seonghobae]

@opencode-agent review the exact current head $head_oid against protected base 2cce96f. Rebased this hourly caller onto current main; contract tests, changed-workflow actionlint, and diff --check were run on the exact rebased source. The caller keeps explicit target identity, bounded dispatch/retry, OIDC/approved secret scope, and no COPILOT token forwarding. Treat predecessor reviews/checks as historical and do not approve from queued or status-only evidence.