idle-draft: idle-subscription dispatcher for the writing pipeline

Elapsed-paced gates, bounded-parallel event-driven dispatch, filesystem-
derived stages with thin human-gate state, citation validation with
quarantine, credential parity check, prompt templates as data.
Per IDLE-DRAFT-PLAN.md in writing/oreillyconsulting.

Claude-Session: https://claude.ai/code/session_01YQDoWNM7XPPii28khFWoMc

data/idle-draft/prompts/review-suggest.md

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+You are producing the **review file** for one human-edited draft in an O'Reilly
+Consulting writing dossier. The draft has already been scored per-paragraph on the
+5-dimension `/15` rubric (Evidence, Judgment, Voice, Rhythm, Register — see
+`score-paragraphs`); your job is the **second pass**: concrete, actionable improvement
+suggestions for every paragraph that scored below the threshold.
+
+## Item
+
+- Dossier: `$dossier`
+- Topic: `$slug`
+- Human-edited draft (already scored, score blocks inline): $draft_path
+- Grading template — apply the same rubric and voice bar when suggesting fixes:
+  $review_prompt_path
+- Voice reference: $style_dir/goes-target-voice.md
+- Score threshold on the `/15` scale: **$review_score_threshold** — any paragraph
+  scoring below this needs a suggestion; paragraphs at or above it need none.
+
+## What to produce
+
+For every paragraph in the draft whose inline score block shows a total below
+`$review_score_threshold`:
+
+- Quote the paragraph's opening few words so a human can locate it.
+- Name which of the five dimensions is weakest and why, in one sentence.
+- Give a **concrete rewrite direction** — not "improve the evidence," but what
+  specific evidence, source, or file/line citation would raise the score, or what
+  specific sentence-level change (cut a hedge word, vary sentence length, cut a
+  vendor name, cite the file instead of the concept) would fix it.
+
+Do not rewrite the paragraph yourself — suggest, don't replace. The human author makes
+the edit.
+
+## Required structure
+
+```markdown
+# Review: <topic title, sentence case>
+
+## Summary
+
+<one paragraph: how many paragraphs scored below threshold, out of how many total,
+and the single most common weak dimension>
+
+## Suggestions
+
+### Paragraph opening: "<first few words...>"
+
+- Score: <total>/15 (weakest dimension: <name>)
+- Suggestion: <concrete, specific>
+
+<repeat per below-threshold paragraph, in document order>
+```
+
+All headings are **sentence case**.
+
+## Output
+
+Write the complete Markdown file to exactly this path, and nothing else:
+
+    $output_path
+
+The dispatcher validates this file (non-empty, starts with a top-level heading) and
+promotes it to its canonical location itself.