docs(kyberforge): add agentskillsio, agentsmd research docs and skill-write examples

- Add agentskillsio/ reference docs (8 topic files, agentskills- prefix stripped)
- Add agentsmd/ reference docs (4 topic files)
- Add skill-write examples: skill-creator (Anthropic), writing-great-skills
  (mattpocock), writing-skills (obra/superpowers) with canonical sources.md files

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

plugins/kyberforge/docs/agentsmd/sources.md

@@ -0,0 +1,29 @@
+# Sources
+
+## agents-md-official
+
+- **URL:** https://agents.md/
+- **Description:** Official agents.md website — overview, how-to guide, supported tools list, sample file, FAQ, and tool configuration snippets
+- **Contributing files:** overview.md, configuration.md, examples.md
+- **Status:** `extracted`
+
+## context7-websites-agents-md
+
+- **URL:** context7:/websites/agents_md
+- **Description:** Context7 index of the official agents.md website (High source reputation, benchmark score 93.78) — overview, governance, cross-tool compatibility, configuration examples, FAQ
+- **Contributing files:** overview.md, configuration.md, examples.md
+- **Status:** `extracted`
+
+## context7-agentsmd-agents-md
+
+- **URL:** context7:/agentsmd/agents.md
+- **Description:** Context7 index of the agentsmd/agents.md repository (Medium source reputation, 26 code snippets) — format spec, nested monorepo patterns, file structure examples
+- **Contributing files:** overview.md, examples.md
+- **Status:** `extracted`
+
+## agents-md-llms-txt
+
+- **URL:** https://agents.md/llms.txt
+- **Description:** Attempted fetch of llms.txt for machine-readable spec
+- **Contributing files:** (none)
+- **Status:** `no content extracted` — HTTP 404