- index.md: rewrite architecture section to reflect DewToolCommand mixin,
CommandRegistry, and per-package config extension pattern
- config.md: update default columns to backlog/doing/done
- features/mcp.md: replace McpToolProvider references with DewToolCommand,
add all 12 tools to the table, add link types table
- features/kanban.md: replace stub with full docs covering storage layout,
ticket format, CLI command reference, link types, and config
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
