chore(kyberforge): move research docs under docs/research/ and update README

Separates development-time reference material from live plugin docs.
agentskillsio/, agentsmd/, and examples/skill-write/ are not shipped with
the plugin — grouping them under research/ makes that boundary explicit.
README now lists all top-level files and explains what research/ is for.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/kyberforge/docs/README.md

@@ -1,7 +1,20 @@
 # docs/
 
-Plugin documentation. Place usage guides, reference material, and examples here.
+Plugin documentation. Not read automatically by Claude Code or GitHub Copilot CLI — reference specific files from skill bodies or agent prompts as needed.
 
-This directory is not read automatically by either Claude Code or GitHub Copilot CLI.
-Reference specific files from your skill bodies or agent prompts when needed
-(e.g. `See references/usage.md for examples`).
+## Files
+
+| Path | Purpose |
+|------|---------|
+| `plugin-marketplace-architecture.md` | Claude Code vs Copilot CLI divergence, two-manifest pattern, plugin constraints, cross-tool compatibility |
+| `adding-agents.md` | How to add agent definitions to the kyberforge plugin |
+
+## research/
+
+Upstream reference material gathered during skill authoring. Not shipped with the plugin — used at development time only.
+
+| Path | Purpose |
+|------|---------|
+| `research/docs/agentskillsio/` | agentskills.io spec, skill authoring, description optimization, eval design, scripts |
+| `research/docs/agentsmd/` | agents.md format spec and cross-tool configuration reference |
+| `research/examples/skill-write/` | Upstream skill examples reviewed when authoring skill-write and skill-audit |