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-theme-cards.md

@@ -0,0 +1,78 @@
+---
+description: Update theme cards
+allowed-tools: Edit(40 - Generated/**), MultiEdit(40 - Generated/**), Write(40 - Generated/**)
+---
+You are analyzing scenes from a science fiction novel to create theme cards.
+
+Scan the files in the `00 - Manuscript/` directory and identify all major themes and central ideas explored in the story.
+
+With EACH theme found:
+
+Update (or create, if needed) the theme card in `40 - Generated/Themes/{theme_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: theme
+name: [full name]
+aliases: [list, of, theme, aliases]
+tags: [theme, generated]
+theme_type: [philosophical/moral/social/technological/existential]
+prominence: [major/minor/subtle]
+appearances: [list, of, chapter, filenames]
+characters_exploring: [list, of, characters, who, embody, this, theme]
+related_themes: [list, of, connected, themes]
+created: {{first_date}}
+modified: {{current_date}}
+---
+```
+
+# [full name]
+
+[Very short description of the theme and its significance in the story]
+
+## Basic Information
+- **Full Name**: [Extract or create descriptive theme name]
+- **Type**: [Philosophical, moral, social, technological, existential, etc.]
+- **Prominence**: [Major, minor, or subtle presence in story]
+- **Core Question**: [The fundamental question this theme explores]
+
+## Theme Exploration
+- **Central Concept**: [The main idea being examined]
+- **Perspectives**: [Different viewpoints presented on this theme]
+- **Contradictions**: [Conflicting approaches or ideas within the theme]
+- **Evolution**: [How understanding of this theme develops]
+
+## Character Embodiment
+- **Primary Characters**: [Characters who most represent this theme]
+- **Character Conflicts**: [How characters struggle with this theme]
+- **Character Growth**: [How characters evolve regarding this theme]
+- **Opposing Views**: [Characters who represent different sides]
+
+## Background
+
+[Background information about this theme, using only information from the scanned chapters]
+
+## Major Events
+
+[Major events that illuminate or develop this theme]
+
+## Symbolic Elements
+- **Symbols**: [Objects, places, or actions that represent this theme]
+- **Metaphors**: [Metaphorical language used to explore the theme]
+- **Imagery**: [Recurring images that reinforce the theme]
+
+## Thematic Development
+- **Introduction**: [How this theme is first presented]
+- **Development**: [How the theme is explored and complicated]
+- **Resolution**: [How the theme is concluded or left open]
+
+## Story Context
+[This theme's role in the overall narrative and its relationship to other themes]