fix(worktrees): record successful setup for issue review handoffs

[thewrz]

This was written agentically; verify its assertions:

Why

Worktrees prepared by parallel-issues did not record successful declared setup. A later review handoff could therefore fail when a convenience setup rerun failed.

What

Record setup success in the shared helper used by both worktree producers and remove the duplicate producer-specific write. Preserve absent-setup semantics and marker validation, with exclusive marker creation.

Decisions

Keep failed first setup fatal; tolerate a failed convenience rerun only when prior setup success is recorded. Regression coverage exercises the complete issue-to-review handoff and unsafe marker shapes.
base=origin/main
files=4
total.insertions=71
total.deletions=12
total.lines=83
operational.files=4
operational.insertions=71
operational.deletions=12
operational.lines=83
generated.files=0
generated.insertions=0
generated.deletions=0
generated.lines=0
lockfile.files=0
lockfile.insertions=0
lockfile.deletions=0
lockfile.lines=0
fixture.files=0
fixture.insertions=0
fixture.deletions=0
fixture.lines=0
non_operational.files=0
non_operational.insertions=0
non_operational.deletions=0
non_operational.lines=0

Testing

• Regression red: five expected failures before implementation.
• agent-run.sh --cmd test --only worktree-setup,create-issue-worktree: 146 assertions passed.
• agent-run.sh --cmd test: 107 suites, shellcheck and repository checks passed (ALL GREEN).

🤖 Co-authored by Codex GPT-6 Astra.

Closes #600

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[thewrz]

This was written agentically; verify its assertions:

Adversarial review receipt

• Reviewer: provider=anthropic; model=claude-fable-5-1; effort=high; mode=cross-provider (reason: Explicit invocation override; Fable 5.1 high)
• Counts: P1=0; P2=0; total=0
• Reviewed head: 70ce956
• Diff payload: wrzonance/agent-kit:603:f9eb987bedf452b6950ab602d1a10c948244b87dc1b1db243c2bbe636a83ad61
• Confirmed finding: none confirmed

🤖 Co-authored by Codex GPT-6.

[thewrz]

This was written agentically; verify its assertions:

Review ledger

Machine-readable record of every review already performed on this PR.

{
  "version": 1,
  "pr": 603,
  "repo": "wrzonance/agent-kit",
  "reviews": [
    {
      "kind": "adversarial",
      "provider": "anthropic",
      "model": "claude-fable-5-1",
      "effort": "high",
      "mode": "cross-provider",
      "harness": "codex",
      "head_sha": "70ce956308d871d8ee5fef53857515329206214b",
      "covered_heads": [
        "70ce956308d871d8ee5fef53857515329206214b"
      ],
      "diff_payload": "wrzonance/agent-kit:603:f9eb987bedf452b6950ab602d1a10c948244b87dc1b1db243c2bbe636a83ad61",
      "counts": {
        "p1": 0,
        "p2": 0
      },
      "reviewed_at": "2026-09-05T05:27:33Z"
    }
  ]
}

🤖 Co-authored by Codex GPT-6.