This is a `plan_improve` task. Revise the latest plan source so it addresses the triggering `plan_review` feedback and becomes ready for another automated plan-review pass.

This task produces a replacement plan artifact, not code. The revised report becomes the latest plan source for downstream lifecycle decisions, including future slice manifests.

Output contract:
- Write the revised plan to `{report_path}`.
- Replace the plan text itself; do not write review commentary around it.
- Preserve the structure expected of a plan artifact:
  - `## Overview of the approach`
  - `## Key design decisions`
  - `## Required implementation steps`
  - `## Acceptance criteria`
  - `## Potential risks or considerations`
- Incorporate the triggering `plan_review` feedback directly into the revised plan.
- If the review challenged slice sizing or sequencing, revise the plan so a future reviewer can produce bounded slices without guessing.
- Keep the revision scoped to plan quality, sequencing, acceptance criteria, and sliceability. Do not implement code in this task.
- Do not output a plan-review verdict or JSON manifest in this task unless the plan source itself explicitly needs an example manifest as part of the design.
