Systemplane Migration (lib-systemplane)

When to use

• User requests systemplane integration for a Go service
• User asks to add hot-reloadable runtime configuration
• Task mentions "systemplane", "runtime config", "hot reload", "LISTEN/NOTIFY config", "admin.Mount"
• User asks to migrate from v4 systemplane to v5

Skip when

• Service is not a Go project
• Task does not involve runtime configuration
• Service has zero hot-reloadable knobs (everything is static env-var-at-startup config)
• Task is documentation-only or non-code

You orchestrate. Agents implement. NEVER use Edit/Write/Bash on Go source files. All code changes go through Task(subagent_type="ring:backend-go"). TDD mandatory for all implementation gates (RED → GREEN → REFACTOR).