fix(review): prebuild offline coverage tools

[seonghobae]

Closes #581

Why

The required OpenCode coverage job runs PR code in a networkless container, but the current default-branch workflow tries to install OS, Python, R, Vulkan, and Rust coverage tools after that network boundary is active. Exact-head reviews fail before evidence can be produced.

What changed

• Build a trusted coverage image before mounting PR source.
• Restrict the networked Docker build context to a fixed Dockerfile and the default-branch hash lock.
• Keep PR execution under docker run --network=none with the existing capability and output controls.
• Pin cargo-llvm-cov 0.8.7 to the official Linux asset and verify SHA-256.
• Remove runtime apt and cargo installation paths and add fail-closed contracts.

Verification

• pytest -q: 632 passed
• Targeted OpenCode/queue contracts: 84 passed
• STRIX_TEST_CASE_FILTER=success bash scripts/ci/test_strix_quick_gate.sh: passed
• actionlint -shellcheck=: passed
• Ruff, bash -n, git diff --check: passed
• The local image build could not complete because the shared local container store is full; the exact-head hosted-runner job is the authoritative build proof.

[opencode-agent]

Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

• Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

• Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

• Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

• Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

• Result: REQUEST_CHANGES

• Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head a6fb4e55f5dc7375d67ad8ef4fa4bfb9473a388f.

• Head SHA: a6fb4e55f5dc7375d67ad8ef4fa4bfb9473a388f

• Workflow run: 29551074187

• Workflow attempt: 1

Coverage evidence

Coverage evidence job did not run or did not publish coverage evidence.

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Workflow: opencode-review.yml"]
  S1 --> I1["GitHub Actions review job"]
  I1 --> R1["Review risk: Workflow: opencode-review.yml"]
  R1 --> V1["actionlint plus required checks"]
  Evidence --> S2["CI script: test_strix_quick_gate.sh"]
  S2 --> I2["review and security gate shell path"]
  I2 --> R2["Review risk: CI script: test_strix_quick_gate.sh"]
  R2 --> V2["bash -n plus Strix self-test"]
  Evidence --> S3["Test: test_opencode_agent_contract.py"]
  S3 --> I3["regression suite"]
  I3 --> R3["Review risk: Test: test_opencode_agent_contract.py"]
  R3 --> V3["targeted test run"]

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[opencode-agent]

OpenCode Review Overview

• Head SHA: a6fb4e55f5dc7375d67ad8ef4fa4bfb9473a388f
• Workflow run: 29551074187
• Workflow attempt: 1
• Gate result: REQUEST_CHANGES (approval step)

Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

• Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

• Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

• Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

• Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

• Result: REQUEST_CHANGES

• Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head a6fb4e55f5dc7375d67ad8ef4fa4bfb9473a388f.

• Head SHA: a6fb4e55f5dc7375d67ad8ef4fa4bfb9473a388f

• Workflow run: 29551074187

• Workflow attempt: 1

Coverage evidence

Coverage evidence job did not run or did not publish coverage evidence.

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Workflow: opencode-review.yml"]
  S1 --> I1["GitHub Actions review job"]
  I1 --> R1["Review risk: Workflow: opencode-review.yml"]
  R1 --> V1["actionlint plus required checks"]
  Evidence --> S2["CI script: test_strix_quick_gate.sh"]
  S2 --> I2["review and security gate shell path"]
  I2 --> R2["Review risk: CI script: test_strix_quick_gate.sh"]
  R2 --> V2["bash -n plus Strix self-test"]
  Evidence --> S3["Test: test_opencode_agent_contract.py"]
  S3 --> I3["regression suite"]
  I3 --> R3["Review risk: Test: test_opencode_agent_contract.py"]
  R3 --> V3["targeted test run"]

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[seonghobae]

Bootstrap evidence and scoped policy exception

Exact head: a6fb4e55f5dc7375d67ad8ef4fa4bfb9473a388f

• Local contract evidence: pytest -q completed with 632 passing tests; the targeted OpenCode/queue contracts completed with 84 passing tests; actionlint, Ruff, bash -n, and git diff --check passed.
• Current-head security checks: CodeQL compatibility and merge-preview jobs, dependency review, OSV, Trivy, Semgrep, Bandit, gitleaks, SBOM, and Scorecard completed successfully.
• Review threads: none.
• Strix run 29550860473 is explicitly excluded as evidence. Its artifact contains logs only and no structured vulnerability report. Direct OpenAI returned quota 429; GitHub Models fallbacks returned 403 and unavailable-model 400. The old default-branch wrapper incorrectly neutralized its own fail-closed gate.
• OpenCode run 29551074187 is also an expected bootstrap failure, not independent evidence against the patch: the old trusted default-branch workflow starts docker run --network=none and then attempts package installation, so coverage fails before the PR version of this workflow can execute. This pull request changes that trusted workflow boundary.

Because pull_request_target correctly executes the default-branch workflow, this infrastructure patch cannot prove its own hosted-runner coverage path before merge. The guarded bootstrap merge will therefore temporarily exempt only the opencode-review required context plus the approval/last-push constraints, retain every other required check, match the exact head above, and restore all protections immediately. The merged implementation must then pass the real hosted-runner image build and the OpenCode-to-Noema sequence on PR #579 before #579 is eligible to merge.

Dismissed for the documented bootstrap exception on exact head a6fb4e5. OpenCode run 29551074187 failed because the trusted default-branch workflow still installs tools after activating the networkless sandbox; PR #582 changes that boundary and cannot execute as trusted pull_request_target code before merge. All non-exempt checks, local contracts, and thread review were verified, and the merged workflow must pass hosted-runner OpenCode then Noema on PR #579.