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/generate/update-character-cards.md

@@ -0,0 +1,70 @@
+---
+description: Update character cards
+allowed-tools: Edit(40 - Generated/**), MultiEdit(40 - Generated/**), Write(40 - Generated/**)
+---
+You are analyzing scenes from a science fiction novel to create character cards. 
+
+Scan the files in the `00 - Manuscript/` directory and identify all story characters along with their aliases.
+
+With EACH character found:
+
+Update (or create, if needed) the character card in `40 - Generated/Characters/{character_name}.md` for use in Obsidian.
+
+Use wiki-style links (`[[file.md]]` or `[[file.md|display name]]`) when referencing manuscript chapters or other files in `40 - Generated/` such as characters, locations, species, etc.  This applies in the frontmatter and in the Markdown below it.
+
+Extract factual information ONLY from the scenes. Do not invent or infer details not explicitly stated in the text.
+
+ALWAYS update the card to match the current format.
+
+Use the following structure:
+
+```yaml
+---
+type: character
+name: [full name]
+aliases: [list, of, character, aliases]
+tags: [character, generated]
+appearances: [list, of, chapter, filenames]
+relationships: [list, of, related, character, names]
+created: {{first_date}}
+modified: {{current_date}}
+---
+```
+
+# [full name]
+
+[Very short description of the character and their role in the story]
+
+## Basic Information
+- **Full Name**: [Extract exact name variations used]
+- **Role/Position**: [Job, title, or function if mentioned]
+- **Relationships**: [Family, friends, colleagues mentioned in scenes]
+
+## Physical Description
+- **Appearance**: [Any physical descriptions from the text]
+- **Age**: [If mentioned or clearly indicated]
+- **Gender**: [If mentioned or clearly indicated]
+
+## Personality & Motivation
+- **Motivations**: [What drives this character based on scenes]
+- **Personality Traits**: [Based on actions and dialogue]
+- **Strengths**: [Based on actions and dialogue]
+- **Weaknesses**: [Based on actions and dialogue]
+- **Fears/Conflicts**: [Internal or external conflicts shown]
+
+## Background
+
+[Background, using only information from the scanned chapters]
+
+## Major Events
+
+[Major events that happened to or because of this character]
+
+## Representative Dialogue
+[Include 3-5 distinctive lines of dialogue that capture this character's voice and speech patterns. Include context for each quote.]
+
+## Key Scenes & Actions
+[List the most important scenes this character appears in and their key actions]
+
+## Story Context
+[This character's role in the overall narrative based on the scenes]