feat(fiction-assistance): register plugin with full bespoke command set

Snapshot of the fiction-assistance plugin in its original Universalis-
specific form before generalization. Adds the missing plugin.json
manifest (subdirectory command paths explicitly listed), moves the two
stray root-level review files into their proper homes (review-all.md
into the reviewing-fiction skill, review-final.md as a command with
frontmatter), and registers the plugin in the marketplace.

Preserved here so the original card-generation and vault-maintenance
commands remain recoverable when the plugin is reduced to a portable
guidance-and-analysis subset in the next commit.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fiction-assistance/commands/review/review-final.md

@@ -0,0 +1,39 @@
+---
+description: Synthesize previous phase reviews into a final manuscript assessment
+allowed-tools: [Write, WebFetch, WebSearch, ListMcpResourcesTool, ReadMcpResourceTool]
+---
+
+Using insights from the previous phases (found in `Notes/Review/`), analyze the overall structure and integration of my manuscript:
+
+**Story Architecture:**
+
+1. **Inciting Incident** - Is it clear, compelling, and well-placed?
+2. **Plot Points** - Are major turning points obvious and impactful?
+3. **Climax** - Does the climax feel earned and satisfying?
+4. **Resolution** - Does the ending resolve key conflicts appropriately?
+
+**Integration Analysis:**
+5. **Scene Flow** - Do scenes connect logically and maintain momentum?
+6. **Pacing Rhythm** - Is there good variation between fast and slow scenes?
+7. **Character Arc Completion** - Do characters grow consistently throughout?
+8. **Setting Consistency** - Do locations and time periods feel coherent?
+9. **Theme Reinforcement** - How do plot, character, and setting support central themes?
+
+**Structural Recommendations:**
+
+- Scenes that should be added, removed, or combined
+- Pacing adjustments needed
+- Character development gaps to address
+- Setting opportunities to enhance story impact
+- Overall readability improvements
+
+**Final Assessment:** Provide a comprehensive evaluation of:
+
+- The manuscript's greatest strengths
+- Top 3-5 areas needing improvement
+- Specific action steps for revision
+- Overall readability score and market readiness
+
+Consider how all 38 story elements work together to create a cohesive, engaging narrative that will keep readers turning pages.
+
+Write the review to `Notes/Review/Final.md`.