docs: create Development-Conventions wiki page

Development-Conventions.-.md

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+# 🛠️ Development Conventions
+
+![Dev Conventions Banner](http://192.168.188.119:30008/pplate/pi_mcps/raw/branch/main/docs/wiki/images/dev-conventions-banner.png)
+
+All MCP servers in this repo follow consistent conventions for maintainability, testability, and Roo Code compatibility.
+
+## Directory Structure
+
+```
+mcp/<server-name>/
+├── src/
+│   ├── __init__.py
+│   └── server.py          ← FastMCP server entry point
+├── tests/
+│   └── test_server.py     ← pytest test suite
+├── pyproject.toml         ← uv-managed dependencies
+├── run.sh                 ← launch script
+├── README.md              ← server documentation
+├── PLAN.md                ← architecture plan (pre-implementation)
+└── ASSESSMENT.md          ← pre-implementation assessment
+```
+
+## FastMCP Pattern
+
+```python
+from fastmcp import FastMCP
+
+mcp = FastMCP("server-name")
+
+@mcp.tool()
+def my_tool(param: str) -> str:
+    """Tool description shown to the AI."""
+    return result
+
+if __name__ == "__main__":
+    mcp.run()
+```
+
+## Package Management
+
+**Always use `uv`** — never `pip` directly:
+
+```bash
+uv init mcp/my-server
+cd mcp/my-server
+uv add fastmcp httpx
+uv sync
+uv run pytest tests/ -v
+```
+
+## Commit Convention
+
+Conventional Commits format:
+
+```
+feat: add webscraper_fetch_section tool
+fix: handle ComfyUI timeout gracefully
+docs: update README with AMD setup
+test: add unit tests for generate_image
+chore: bump fastmcp to 2.1.0
+```
+
+## Creating a New MCP Server
+
+Use the `new-mcp-server` Roo skill in MCP Builder mode:
+
+1. Switch to 🔧 MCP Builder mode in Roo Code
+2. Say: "Create a new MCP server for `<purpose>`"
+3. Roo loads the `new-mcp-server` skill and scaffolds everything
+
+## Gitea Repository
+
+Code at: `http://192.168.188.119:30008/pplate/pi_mcps`
+
+Push with the `gitea-push` Roo skill for conventional commit format.