Convert remaining ✅ emoji status messages in g3-cli to use the
consistent G3Status formatting system:
- accumulative.rs: 'autonomous run ... [done]'
- commands.rs /clear: 'clearing session ... [done]'
- commands.rs /readme: 'reloading README ... [done/failed/error]'
- commands.rs /unproject: 'unloading project ... [done]'
This provides a consistent 'g3: action ... [status]' format across
all CLI status messages.