chore: cerrar issue 0018 — shared knowledge

- Mover dev/issues/0018-shared-knowledge.md a completed/
- Actualizar dev/issues/README.md: estado completado
- Sistema de conocimiento compartido completamente implementado

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

dev/issues/README.md

@@ -22,7 +22,7 @@ afectados y notas de implementacion.
 | 15 | Multi-platform Telegram      | [0015-multi-platform-telegram.md](0015-multi-platform-telegram.md)   | pendiente  |
 | 16 | Skills system                | [0016-skills-system.md](0016-skills-system.md)                       | pendiente  |
 | 17 | MCP client tools             | [0017-mcp-client-tools.md](completed/0017-mcp-client-tools.md)      | completado |
-| 18 | Shared knowledge             | [0018-shared-knowledge.md](0018-shared-knowledge.md)                 | pendiente  |
+| 18 | Shared knowledge             | [0018-shared-knowledge.md](completed/0018-shared-knowledge.md)       | completado |
 | 19 | Prompt injection hardening   | [0019-prompt-injection-hardening.md](completed/0019-prompt-injection-hardening.md) | completado |
 | 20 | Aislar claude -p del repo    | [0020-claude-code-sandbox.md](completed/0020-claude-code-sandbox.md) | completado |
 | 21 | Threads default config       | (completado via branch)                                              | completado |