Set GIT_AUTHOR_NAME per agent session (gt-6r18e.1)

Export GIT_AUTHOR_NAME alongside BD_ACTOR in all agent session startup
locations. This enables git log --author queries for agent work while
keeping GIT_AUTHOR_EMAIL as the workspace owner.

Files updated:
- internal/session/manager.go (polecat sessions)
- internal/daemon/daemon.go (deacon, witness, polecat via daemon)
- internal/daemon/lifecycle.go (polecat lifecycle)
- internal/cmd/*.go (crew, mayor, deacon, witness, refinery, up, handoff)
- internal/session/manager_test.go (updated test expectations)
- docs/federation.md (marked feature as implemented)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/cmd/start.go

@@ -340,7 +340,7 @@ func ensureRefinerySession(rigName string, r *rig.Rig) (bool, error) {
 
 	// Launch Claude in a respawn loop
 	// Export GT_ROLE and BD_ACTOR in the command since tmux SetEnvironment only affects new panes
-	loopCmd := `export GT_ROLE=refinery BD_ACTOR=` + bdActor + ` && while true; do echo "🛢️ Starting Refinery for ` + rigName + `..."; claude --dangerously-skip-permissions; echo ""; echo "Refinery exited. Restarting in 2s... (Ctrl-C to stop)"; sleep 2; done`
+	loopCmd := `export GT_ROLE=refinery BD_ACTOR=` + bdActor + ` GIT_AUTHOR_NAME=` + bdActor + ` && while true; do echo "🛢️ Starting Refinery for ` + rigName + `..."; claude --dangerously-skip-permissions; echo ""; echo "Refinery exited. Restarting in 2s... (Ctrl-C to stop)"; sleep 2; done`
 	if err := t.SendKeysDelayed(sessionName, loopCmd, 200); err != nil {
 		return false, fmt.Errorf("sending command: %w", err)
 	}