The marketplace is registered externally as `everything-claude-code`,
so the Claude Code CLI looks for a plugin named `everything-claude-code`
within it. Both `.claude-plugin/marketplace.json` and
`.claude-plugin/plugin.json` used the short alias `ecc` for the plugin
`name` field, causing a lookup miss at install/update time:
Error: Plugin everything-claude-code not found in marketplace everything-claude-code
Change the `name` field in both files to match the external identifier.