chore: strip remaining pre-fork version references

Second pass — removes chat-switchboard version numbers from config
field docs, section headers, file headers, and test comments. These
were pre-fork version tags that don't apply to switchboard-core.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/handlers/teams.go

@@ -419,7 +419,7 @@ func (h *TeamHandler) ListTeamAuditActions(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"actions": actions})
 }
 
-// ── Team Roles API (v0.3.4) ─────────────────
+// ── Team Roles API ─────────────────
 
 // builtinRoles are always present in every team's role list.
 var builtinRoles = []string{"admin", "member"}