chore: add review agent memory files (#120)

Author: amondnet

.claude/agent-memory/review-review-documentation-analyzer/MEMORY.md

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+# Agent Memory Index
+
+- [Project documentation conventions](project-doc-conventions.md) — Skill reference format: frontmatter with name/description, source comments at bottom, no `allowed-tools` in SKILL.md index files

.claude/agent-memory/review-review-documentation-analyzer/project-doc-conventions.md

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+---
+name: Project documentation conventions
+description: Established conventions for skill reference files and SKILL.md index files in this plugin marketplace repo
+type: project
+---
+
+Skill reference files use YAML frontmatter with `name` and `description` fields (no `allowed-tools`).
+Source URL comments appear at the bottom of each reference file in an HTML comment block.
+SKILL.md index files use a table structure with Topic/Description/Reference columns, grouped into sections (Core, Features, Advanced, API).
+Plugin-only (knowledge-only) plugins have `plugin.json` with `"skills": "./.agents/skills/"` and no `mcpServers` field.
+The `skills/nuxt-i18n/` top-level directory mirrors `plugins/nuxt-i18n/.agents/skills/nuxt-i18n/` — both sets of files are identical and appear to be duplicates that are generated/synced.
+
+**Why:** Observed in nuxt-i18n PR (2026-03-28), first knowledge-only plugin without MCP server.
+**How to apply:** When reviewing skill-only plugins, expect no `mcpServers` in plugin.json and no `allowed-tools` in SKILL.md.