Tone down review loops: single-pass plan review, raise issue bar

- Remove chunk-based plan review in favor of single whole-plan review
- Add Calibration sections to both reviewer prompts so only serious
  issues block approval
- Reduce max review iterations from 5 to 3
- Streamline reviewer checklists (spec: 7→5, plan: 7→4 categories)

skills/writing-plans/SKILL.md

@@ -112,22 +112,17 @@ git commit -m "feat: add specific feature"
 
 ## Plan Review Loop
 
-After completing each chunk of the plan:
+After writing the complete plan:
 
-1. Dispatch plan-document-reviewer subagent (see plan-document-reviewer-prompt.md) with precisely crafted review context — never your session history. This keeps the reviewer focused on the plan, not your thought process.
-   - Provide: chunk content, path to spec document
-2. If ❌ Issues Found:
-   - Fix the issues in the chunk
-   - Re-dispatch reviewer for that chunk
-   - Repeat until ✅ Approved
-3. If ✅ Approved: proceed to next chunk (or execution handoff if last chunk)
-
-**Chunk boundaries:** Use `## Chunk N: <name>` headings to delimit chunks. Each chunk should be ≤1000 lines and logically self-contained.
+1. Dispatch a single plan-document-reviewer subagent (see plan-document-reviewer-prompt.md) with precisely crafted review context — never your session history. This keeps the reviewer focused on the plan, not your thought process.
+   - Provide: path to the plan document, path to spec document
+2. If ❌ Issues Found: fix the issues, re-dispatch reviewer for the whole plan
+3. If ✅ Approved: proceed to execution handoff
 
 **Review loop guidance:**
 - Same agent that wrote the plan fixes it (preserves context)
-- If loop exceeds 5 iterations, surface to human for guidance
-- Reviewers are advisory - explain disagreements if you believe feedback is incorrect
+- If loop exceeds 3 iterations, surface to human for guidance
+- Reviewers are advisory — explain disagreements if you believe feedback is incorrect
 
 ## Execution Handoff