feat: consolidate marketplace skills into kyberforge plugin

Moves create-plugin, marketplace-architect, write-skill, and write-eval
from canonical .agents/skills/ into plugins/kyberforge/skills/, along
with all bundled sub-files, evals, and the plugin-marketplace-architecture
research doc. Bundles templates/plugin/ into create-plugin/assets/plugin-template/
so the skill is self-contained after install-time caching. Removes
templates/plugin/ and docs/research/plugin-marketplace-architecture.md
from the repo root as they are now exclusively in the plugin.

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

plugins/kyberforge/skills/marketplace-architect/references/copilot-cli.md

@@ -0,0 +1,143 @@
+# GitHub Copilot CLI Plugin Reference
+
+Verified against docs.github.com as of June 2026.
+
+---
+
+## Directory structure
+
+```text
+plugin-root/
+├── plugin.json           # at plugin root (NOT in .claude-plugin/)
+├── skills/               # skill directories: <name>/SKILL.md (same as Claude Code)
+├── agents/               # agent files: <name>.agent.md (differs from Claude Code)
+├── hooks.json            # at plugin root (differs from Claude Code: hooks/hooks.json)
+└── .mcp.json             # at plugin root (same as Claude Code)
+```
+
+---
+
+## plugin.json schema (Copilot)
+
+```json
+{
+  "name": "my-plugin",
+  "description": "What it does",
+  "version": "1.0.0",
+  "author": { "name": "Name", "email": "you@example.com" },
+  "license": "MIT",
+  "keywords": [],
+  "agents": "agents/",
+  "skills": ["skills/"],
+  "hooks": "hooks.json",
+  "mcpServers": ".mcp.json"
+}
+```
+
+Key difference from Claude Code: Copilot expects component path declarations inside
+`plugin.json` (`"skills": "skills/"`, `"agents": "agents/"`, etc.). Claude Code instead
+defaults to standard dirs and takes path overrides only via the marketplace entry.
+This means the same `plugin.json` may need these fields for Copilot but not for Claude.
+
+---
+
+## marketplace.json schema (Copilot)
+
+```json
+{
+  "name": "my-ai-marketplace",
+  "owner": { "name": "Your Name", "email": "you@example.com" },
+  "metadata": { "description": "Agents, skills and workflows", "version": "1.0.0" },
+  "plugins": [
+    {
+      "name": "startup-cto",
+      "source": "./plugins/startup-cto",
+      "description": "...",
+      "version": "1.0.0"
+    }
+  ]
+}
+```
+
+Copilot's primary marketplace manifest path is `.github/plugin/marketplace.json`.
+It also reads `.claude-plugin/marketplace.json` as a fallback.
+Relative `source` paths: `./x` and `x` are both valid (Claude requires `./`).
+
+---
+
+## Agent file format
+
+Copilot agents use `.agent.md` extension with frontmatter:
+
+```markdown
+---
+name: my-agent
+description: What this agent does
+tools:
+  - read_file
+  - run_command
+---
+
+Agent instructions here.
+```
+
+Claude Code agents use `.md` extension without the `.agent.md` suffix.
+If shipping agents for both tools, create both files:
+- `agents/my-agent.md` — Claude Code
+- `agents/my-agent.agent.md` — Copilot CLI
+
+---
+
+## CLI commands
+
+```bash
+# Install plugin locally (development)
+copilot plugin install ./my-plugin
+
+# List installed plugins
+copilot plugin list
+
+# In interactive mode
+/plugin list
+/skills list
+/agent
+
+# Reload after changes
+/reload-plugins
+
+# Uninstall (uses bare plugin name, not @marketplace form)
+copilot plugin uninstall <name>
+
+# Marketplace
+copilot plugin marketplace add owner/repo
+```
+
+> ⚠️ **UNVERIFIED: Copilot marketplace install command.**
+> The `update`/`uninstall` commands take a bare `<name>`. Whether install from a marketplace
+> uses `<name>@<marketplace>` (Claude Code's form) or a bare `<name>` is not confirmed in docs.
+> Run `copilot plugin install --help` before documenting the install command anywhere.
+
+---
+
+## Validation
+
+Copilot has no documented `plugin validate` command. For Copilot-side validation, run manual checks:
+- Valid JSON in `plugin.json` and `marketplace.json`
+- Required fields: `name`, `description`
+- Unique plugin names across marketplace
+- Kebab-case plugin names
+- All `source` paths resolve to existing directories
+- `.agent.md` files have valid YAML frontmatter with `name`, `description`, `tools`
+
+---
+
+## Key differences from Claude Code (summary)
+
+| What | Claude Code | Copilot CLI |
+|---|---|---|
+| Plugin manifest location | `.claude-plugin/plugin.json` | `plugin.json` at plugin root |
+| Agent files | `agents/<name>.md` | `agents/<name>.agent.md` |
+| Hooks file | `hooks/hooks.json` | `hooks.json` at plugin root |
+| Component paths | Declared in marketplace entry | Declared in `plugin.json` |
+| Validate command | `claude plugin validate` | None — manual checks only |
+| Relative source `./` | Required | Optional (`x` also valid) |