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broker: expand member groups to ancestor paths at drain time (pull model) - @flexicar message reaches peers in @flexicar/core, @flexicar/output, etc. - Resolved at drainForMember — no DB changes, fully backward-compatible - Any depth: flexicar/team/backend also matches @flexicar and @flexicar/team cli: wire --role all the way through to session config + env - Config.role field added - launch.ts stores role in sessionConfig, passes CLAUDEMESH_ROLE env var - mcp/server.ts includes role in identity string - manager.ts auto-joins groups from config on WS connect (--groups flag now works) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>