docs(issues): cierra 0053 (kanban chat panel)

Chat lateral en apps/kanban implementado:
- backend: chat.go + tools.go con dispatch a 11 tools
  (list_board, create_column, rename_column, delete_column,
   reorder_columns, create_card, update_card, delete_card,
   move_card, card_history, find_cards)
- runClaude usa subprocess `claude -p --model claude-sonnet-4-6`
  con suscripcion del usuario (sin ANTHROPIC_API_KEY)
- frontend: ChatPanel en AppShell.Aside, persistencia localStorage,
  markdown via react-markdown + remark-gfm
- smoke test verde: crear cols, crear cards, queries conversacionales

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

dev/issues/README.md

@@ -68,3 +68,4 @@
 | [0049k](completed/0049k-graph-explorer-app.md) | App graph_explorer (proyecto osint_graph) — integracion final | completado | alta | feature | parte de 0049 |
 | [0050](0050-jupyter-exec-collab-client-failure.md) | `jupyter_exec` falla por cliente colaborativo (workaround documentado) | pendiente | media | bug | — |
 | [0051](0051-extraction-pipeline-followups.md) | Funciones pendientes del pipeline NER+RE (NuExtract, extract_graph_from_pdf, spaCy ES V2, kernel startup fix, REBEL EN) | pendiente | media | feature | — |
+| [0053](completed/0053-kanban-chat-panel.md) | Chat lateral en apps/kanban via `claude -p` (sonnet, persistencia localStorage) | completado | media | feature | — |