Docs: Add telegram_mcp_update AI skill

.agents/skills/telegram_mcp_update/SKILL.md

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+---
+name: Update Telegram MCP Tools
+description: Procedure for updating the 'ALLOWED_TOOLS' environment variable in the Telegram MCP server configuration, preventing SQLite lock issues, and contributing upstream.
+---
+
+# Updating Telegram MCP Tools
+
+**Use this skill when** the user requests updating the allowed tools for their `telegram-mcp` server, changing its configuration, or sharing changes upstream via Pull Request.
+
+Follow this precise procedure to prevent orphaned Python processes from locking the SQLite database or to push changes cleanly to the Open Source project.
+
+## Procedure
+
+1. **Update Configuration**:
+   Edit the `ALLOWED_TOOLS` environment variable inside the `telegram-mcp` section of `mcp_config.json` with the new comma-separated tools list.
+
+2. **Kill Orphaned Processes**:
+   Whenever config is modified, the IDE tries to restart the MCP automatically. Because Telethon/Python does not always shut down cleanly, the old process stays in the background locking `telegram_session.session`.
+   You **MUST** proactively run the following command to terminate hanging instances BEFORE asking the user to verify (adjust the string `telegram-mcp` if the user named the directory differently):
+   ```bash
+   pkill -f "telegram-mcp"
+   ```
+
+3. **Instruct the User to Refresh**:
+   Inform the user what tools were updated and explicitly ask them to click the **"Refresh"** button in their "Manage MCP servers" UI. The server will restart correctly.
+
+4. **Contributing Upstream (Pull Requests)**:
+   Si el usuario pide subir el código para aportar al proyecto original (`upstream`), aplica esta secuencia estandarizada:
+   - Revisa si el remoto secundario ya existe. Si origin es el oficial y el usuario no tiene permisos: asegúrate de tener el alias `fork` configurado apuntando a su bifurcación personal (Ej. `nhomar/telegram-mcp`).
+   - Genera una rama nueva: `git checkout -b feat/nombre-del-cambio`.
+   - Efectúa el `commit` documentando las razones concretas del cambio.
+   - Sube forzosamente los cambios al *fork* del usuario: `git push -f fork feat/nombre-del-cambio`.
+   - Emplea el cliente oficial de GitHub ubicando siempre explícitamente el repositorio principal `-R chigwell/telegram-mcp` (o el correspondiente) para levantar el PR oficial con formato documentado:
+     ```bash
+     gh pr create -R chigwell/telegram-mcp --title "Detalle formal del asunto" --body "Explicación integral del impacto de este merge"
+     ```