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/agentskillsio/sources.md

@@ -0,0 +1,57 @@
+# Sources
+
+## agentskills-home
+
+- **URL:** https://agentskills.io/home.md
+- **Description:** Agent Skills overview — what it is, why it exists, progressive disclosure model, ecosystem of 35+ implementing tools
+- **Contributing files:** agentskills-overview.md
+- **Status:** `extracted`
+
+## agentskills-spec
+
+- **URL:** https://agentskills.io/specification.md
+- **Description:** Complete SKILL.md format specification — frontmatter fields, constraints, body content, optional directories, progressive disclosure levels, file references, validation
+- **Contributing files:** agentskills-overview.md, agentskills-specification.md, agentskills-examples.md
+- **Status:** `extracted`
+
+## agentskills-best-practices
+
+- **URL:** https://agentskills.io/skill-creation/best-practices.md
+- **Description:** Best practices for skill creators — starting from real expertise, spending context wisely, calibrating control, instruction patterns (gotchas, templates, checklists, validation loops)
+- **Contributing files:** agentskills-skill-authoring.md, agentskills-examples.md
+- **Status:** `extracted`
+
+## agentskills-optimizing-descriptions
+
+- **URL:** https://agentskills.io/skill-creation/optimizing-descriptions.md
+- **Description:** How to systematically test and improve skill descriptions for triggering accuracy — eval queries, trigger rate testing, train/validation splits, optimization loop
+- **Contributing files:** agentskills-optimizing-descriptions.md, agentskills-examples.md
+- **Status:** `extracted`
+
+## agentskills-evaluating-skills
+
+- **URL:** https://agentskills.io/skill-creation/evaluating-skills.md
+- **Description:** Eval-driven skill quality improvement — test case design, workspace structure, assertion writing, grading, benchmarking, human review, iteration loop
+- **Contributing files:** agentskills-evaluating-skills.md, agentskills-examples.md
+- **Status:** `extracted`
+
+## agentskills-using-scripts
+
+- **URL:** https://agentskills.io/skill-creation/using-scripts.md
+- **Description:** Using scripts in skills — one-off commands, self-contained scripts with inline dependencies, designing scripts for agentic use (no interactive prompts, --help, structured output, idempotency)
+- **Contributing files:** agentskills-scripts.md
+- **Status:** `extracted`
+
+## agentskills-quickstart
+
+- **URL:** https://agentskills.io/skill-creation/quickstart.md
+- **Description:** Step-by-step guide to creating a first skill (roll-dice example), how discovery/activation/execution work in practice
+- **Contributing files:** agentskills-overview.md, agentskills-examples.md
+- **Status:** `extracted`
+
+## agentskills-llms-txt
+
+- **URL:** https://agentskills.io/llms.txt
+- **Description:** Documentation index used for source discovery — lists all available pages with URLs
+- **Contributing files:** (none — used for discovery only)
+- **Status:** `extracted`